Sheffield trams (Supertram) approaching a stop in Church Street, Cathedral Quarter, Sheffield, Yorkshire, England

Jungle at Arenal Hanging Bridges where rainforest canopy is accessible via walkways, La Fortuna, Alajuela Province, Costa Rica, Central America

Buttress root in jungle at Arenal Hanging Bridges where rainforest canopy is accessible via walkways, La Fortuna, Alajuela Province, Costa Rica, Central America

Jungle at Arenal Hanging Bridges where rainforest canopy is accessible via walkways, La Fortuna, Alajuela Province, Costa Rica, Central America

Waterfall at Arenal Hanging Bridges where the rainforest is accessible via walkways, La Fortuna, Alajuela Province, Costa Rica, Central America

Jungle at Arenal Hanging Bridges where rainforest canopy is accessible via walkways, La Fortuna, Alajuela Province, Costa Rica, Central America

Waterfall at Arenal Hanging Bridges where the rainforest is accessible via walkways, La Fortuna, Alajuela Province, Costa Rica, Central America

View inside an ice cave under the south Vatnajokull Glacier, captured at sunrise during winter when the ice caves are accessible, near Jokulsarlon, Southern Iceland, Iceland, Polar Regions

View inside an ice cave under the south Vatnajokull Glacier, captured at sunrise during winter when the ice caves are accessible, near Jokulsarlon, Southern Iceland, Iceland, Polar Regions

A climber makes her way up the summit ridge of Stok Kangri at 6137 metres, a popular and easily accessible trekking peak in the northern Zanskar Range, Ladakh, India, Asia

Zubizuri Footbridge, designed by Santiago Calatrava, Nervion River, Bilbao, Basque Country, Spain, Europe

Serra de Tramuntura, hiker on Puig de Massanella Mallorca's highest accessible peak, Majorca, Balearic Islands, Spain, Mediterranean, Europe

Close up of the eastern half of Mitten Ridge, accessible by way of the Hangover Trail, Sedona, Arizona, United States of America, North America

Views of the Signpost just outside of Stanley, the capital and only true city in the Falkland Islands, South Atlantic Ocean, South America

Caravan (Trailer) at the camping area of Sand Hollow State Park, opened in 2003, covering 20000 acres, near St. George, Utah, United States of America, North America

Alp Grum, Canton of Grisons, Switzerland

View of Waldron Canyon southwest of Hermit Canyon in winter, accessible via Hermit Trail, Grand Canyon, Arizona, United States of America, North America

Playa Las Tumbas, Cabo San Antonio, Guanahacabibes Peninsular, National Park and Biosphere Reserve, Pinar del Rio Province, Cuba, West Indies, Central America

Serra de Tramuntura, hiker on Puig de Massanella, Mallorca's highest accessible peak, Majorca, Balearic Islands, Spain, Mediterranean, Europe

Off trail view of Waldron Canyon southwest of Hermit Canyon in winter, accessible via Hermit Trail to the Waldron Trail Junction, Grand Canyon, Arizona, United States of America, North America

Briksdal glacier, one of the most accessible and best known arms of the Jostedalsbreen glacier, Stryn, Vestland, Norway, Scandinavia, Europe

View of Long Island one of the most undisturbed in the world, the island is home to a private resort accessible only by boat, Antigua, Leeward Islands, West Indies, Caribbean, Central America

The beach and multi-coloured cliffs at Alum Bay, accessible by chairlift, Isle of Wight, Hampshire, England, United Kingdom, Europe

Eruptions from vents in the crater of Mount Yasur, Yasur Volcano, Tanna Island, Vanuatu, PacificEruptions from vents in the crater of Mount Yasur in east Tanna, one of the Pacific's most accessible & active volcanoes

Eruption from vent in the crater of Mount Yasur, Yasur Volcano, Tanna Island, Vanuatu, PacificEruption from vent in the crater of Mount Yasur in east Tanna, one of the Pacific's most accessible & active volcanoes

Tourists on the ash plain of Mt Yasur in east Tanna, one of the Pacific's most accessible & active volcanoes, Tanna Island, Yasur Volcano, Vanuatu

Indonesia a kindergarten in banda aceh which lost many of children to tsunami, been rebuilt. schools director halimah anwar bustam (seen here in foreground) describes horrors suffered: area kids came from completely flattened by waves. On that fateful sunday children were in their homes, or many were already on beach having. So many died that morning. It devastating. Only we getting things back together, very grateful to helping with reconstruction of damaged building. staff give up a portion of their (already) salaries to sponsor poor children from outlying villages to come to school. structure includes offices staff, a library, prayer room wheelchair accessible classroom.__ Photograph taken in banda aceh, -december 2006, 2 years after tsunami of december 26th 2004 devasted much of coastal region. Taken to illustrate reconstruction work projects of (catholic relief services) of sponsored photo tour

Looking south past the 6545ft 'Watchman' from Zion Canyon, the most accessible part of this stunning national park with its 2000-3000ft sandstone cliffs, Zion National Park, Utah, United States of America (USA), North America

The 6904ft 'Beehives' in the western walls of the south end of Zion Canyon, in the most accessible part of this stunning national park with its 2000-3000ft sandstone walls, Zion National Park, Utah, United States of America (USA), North America

The 6904ft 'Beehives' in the western walls of the south end of Zion Canyon, in the most accessible part of this stunning national park with its 2000-3000ft sandstone walls, Zion National Park, Utah, United States of America (USA), North America

Using ancient techniques of wattle & daub, you can see on this hut how it was built. This sustainable and accessible technique is finnished off with a 20th century roof addition. Jinja, Uganda, East Africa

The Lindblad Expedition ship National Geographic Explorer, Svalbard Archipelago, Antarctica

The Lindblad Expedition ship National Geographic Explorer, Svalbard Archipelago, Antarctica

The Lindblad Expedition ship National Geographic Explorer, Svalbard Archipelago, Antarctica

The Lindblad Expedition ship National Geographic Explorer, Svalbard Archipelago, Antarctica

Living Room with Grand Piano

Walking routes signpost in Dutch, some suitable for wheelchairs, Westhove Palace near Domburg, Walcheren, Zeeland, Netherlands, Europe

Aid for the blind on a traffic light in the Neustadt district, Dresden, Saxony, Germany, Europe

Escape corridor with a sign for wheelchair users

AquaDom of the Sealife in the lobby of the Radisson SAS hotel in the CityQuartier DomAquaree, 14 meter tall aquarium with elevator inside, accessible to visitors of the Sealife Center, Berlin Mitte district, Berlin, Germany, Europe

Wall painting depicting hygiene measures, school for the deaf, Beliatta, Sri Lanka, Ceylon, South Asia, Asia

Blue marked parking for disabled, Krakow, Poland, Europe

Accessible cave with a small waterfall and lake, Grotte aux Fees, Valais, Switzerland, Europe

Oslo Opera House at Oslofjord with an accessible roof made of Carrara marble, Oslo, Norway, Scandinavia, Europe

Blue marked parking place for disabled people, Romania, Europe

Blue marked parking for disabled, Krakow, Poland, Europe

Walls around the old town, Dubrovnik, Croatia, Europe

Pictogram, disabled parking, Thuringia, Germany, Europe

Evening on the beach in Arcachon, boardwalk, disabled access to the beach, France, Europe, Atlantic Coast

Sign, handicapped accessible path, Tenerife, Canary Islands, Spain, Europe

Noerdlingen, only city of Germany with a nearly completely received accessible city wall, Bavaria , Germany

Noerdlingen, only city of Germany with a nearly completely received accessible city wall, Bavaria , Germany

Close-up of a closed door of a house

Swimming pool view though an arch way

Arrow sign on a picket fence, Texas, USA

Close-up of a disabled sign

Low angle view of a keep out sign

Facade of a building

Close-up of a door handle on a door, Positano, Amalfi Coast, Salerno, Campania, Italy

Rear view of a young man taking a photograph, Haleakala National Park, Maui, Hawaii Islands, USA

Telephone booth outside a building

The region of the Fourth Cataract, the most impassable of all rapids of the Nile. Still today the water rapids cannot be crossed by any large boats making the region accessible only via a sandy and rocky desert track. The region is among the most neglected areas in Northern Sudan. Apart from basic educational institutions virtually no public infrastructure such as tarred roads, bridges or ferry boats and hospitals exist.

A male mountaineer is standing on the summit of the Barrhorn, a mountain peak of 3610 meter in the Swiss Alps. It is one of the highest summits in Europe to be accessible to experienced hikers. The region of Wallis is home to over 40 mountain peaks higher than 4000 meter. The highest one that is completely situated within the Swiss borders is the Dom, which is visible in the background. The Mattertal runs from Visp all the way to Zermatt and is a paradise for all outdoor enthusiasts, like hikers, climbers, alpinists, walkers, mountain bikers and nature lovers.

The region of the Fourth Cataract, the most impassable of all rapids of the Nile. Still today the water rapids cannot be crossed by any large boats making the region accessible only via a sandy and rocky desert track. The region is among the most neglected areas in Northern Sudan. Apart from basic educational institutions virtually no public infrastructure such as tarred roads, bridges or ferry boats and hospitals exist.

Railay Beach is a popular tourist destination near Krabi, Thailand on the Andaman Sea. Accessible only by boat, the beach includes a number of high end resorts for tourists from around the world.

A paraplegic woman posing for the camera after working out using an overhead press in a fitness facility; Sherwood Park, Alberta, Canada

Paraplegic man with forearm crutches and service dog enjoys the ocean view from a boardwalk, with dog standing up against the wooden railing, Boynton Beach, Florida, United States of America

Paraplegic man with forearm crutches and service dog enjoys walking along the ocean promenade, Boynton Beach, Florida, United States of America

Paraplegic man in a manual wheelchair and his service dog enjoy walking along the ocean promenade, Boynton Beach, Florida, United States of America

A paraplegic man working out using an overhead press in fitness facility; Sherwood Park, Alberta, Canada

A paraplegic man working out using an overhead press in fitness facility; Sherwood Park, Alberta, Canada

Paraplegic man in wheelchair with service dog enjoys the ocean view from a boardwalk, Boynton Beach, Florida, United States of America

Paraplegic man in wheelchair with service dog enjoys the ocean view from a boardwalk, Boynton Beach, Florida, United States of America

A paraplegic man working out using a crossover pulley weight lifting apparatus in a fitness facility; Sherwood Park, Alberta, Canada

Maori woman with Cerebral Palsy in a wheelchair going down a sidewalk; Wellington, New Zealand

A boardwalk path leads hikers through the hiking route on the Vatnajokull National Park plateau, Iceland

Cables, Mont Blanc, Aiguille Du Midi, Chamonix, France

People with disabilities and an adaptive golf cart at a putting green

Instructor helping a Man with spinal cord injury to learn golf

Man in wheelchair who had Spinal Meningitis using a ramp and waving

Man who had Spinal Meningitis pulling his wheelchair into his accessible vehicle

Man with spinal cord injury in an adaptive cart at golf putting green

A paraplegic mother lifting a baby from a customized side-opening crib that allows her to put her baby down for a nap from her position in a wheelchair: Edmonton, Alberta, Canada

Woman with spinal cord injury getting into her desk so she can stand up

A paraplegic mom in a wheelchair talking with her daughter and holding her baby in her lap while working in her kitchen; Edmonton, Alberta, Canada

Woman with multiple sclerosis talking on a mobile phone with a service dog

Man with spinal cord injury in disability racing bike

Maori woman with Cerebral Palsy in a wheelchair on a grass field in a park area; Wellington, New Zealand

A senior paraplegic man working out using a circular handheld device in fitness facility; Sherwood Park, Alberta, Canada

A paraplegic man working out using a crossover pulley weight lifting apparatus in a fitness facility; Sherwood Park, Alberta, Canada

Two paraplegic friends giving each other a fist bump of encouragement after working out at a fitness facility: Sherwood Park, Alberta, Canada

A group of paraplegic friends raising their hands together in victory after a workout in fitness facility: Sherwood Park, Alberta, Canada

Two paraplegic friends talking together and encouraging each other after working out at a fitness facility: Sherwood Park, Alberta, Canada

One paraplegic man working out using an overhead press in fitness facility while his disabled friend watches; Sherwood Park, Alberta, Canada

A senior paraplegic man working out using a circular handheld device in fitness facility; Sherwood Park, Alberta, Canada

A view from behind of a paraplegic woman working out using a lat pull down machine in a fitness facility; Sherwood Park, Alberta, Canada

A paraplegic man looking at the camera and giving an affirming hand gesture after working out using an overhead press in a fitness facility; Sherwood Park, Alberta, Canada

A view from behind of a paraplegic woman working out using a lat pull down machine in a fitness facility; Sherwood Park, Alberta, Canada

A paraplegic man working out using free weights in front of a mirror at recreational centre: Sherwood Park, Alberta, Canada

A paraplegic man resting after working out using an overhead press in fitness facility; Sherwood Park, Alberta, Canada