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

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

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

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

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

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

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

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

View of Agios Spiridon Beach from Monastery of Paleokastritsa in Palaiokastritsa, Corfu, Ionian Sea, Greek Islands, Greece, Europe

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

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

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

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

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

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

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

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.

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

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

Sunrise over Paoakulani Isle, Moku Puka Isle and Pa'alaea Islands seabird sanctuaries, Pololu Valley Lookout, North Kohala, Hamakua Coast. This area is only accessible by boat, Island of Hawaii, Hawaii, United States of America