Camino de Santiago spiritual trail marker on the road in Salamanca, Castilla y Leon, Spain, Europe

The Galapagos Post Office where from the 18th century sailors left letters for homebound crews to take for delivery, Floreana Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Burial Ground for Slaves and Free Blacks up to 1854, containing 180 graves, St. Peter's Churchyard, St. George, Bermuda

Burial Ground for Slaves and Free Blacks up to 1854, containing 180 graves, St. Peter's Churchyard, St. George, Bermuda

Burial Ground for Slaves and Free Blacks up to 1854, containing 180 graves, St. Peter's Churchyard, St. George, Bermuda

Punta Cupetti, top of the mountain, Sardinia, Italy, Mediterranean, Europe

Trans Pennine Trail Marker on Hornsea Seafront, East Riding of Yorkshire, Yorkshire, England, United Kingdom, Europe

A trail marker below the Gore mountains at Vail Ski Resort, Vail, Colorado, United States of America, North America

Coastal scenery on the South West Coast Path, East of Port Isaac, Cornwall, UK.

Coastal scenery on the South West Coast Path, East of Port Isaac, Cornwall, UK, with a path marker.

Lava lizard (Microlophus spp) on a trail marker in the Galapagos Island Archipeligo, Ecuador. MORE INFO: Many of the islands within the Galapagos Island Archipeligo have their own endemic species.

Hiking woman, National Park Hohe Tauern, Tyrol, Austria

Climbers ascending Mt. Marmolada, Dolomites, Westgrat fixed rope route, Mt. Marmolada in the back, Trentino, Italy, Europe

Road in Himalayas marked with stone cairns. Ladakh, India, Asia

Trail marker of the Lewis and Clark National Historic Trail, Montana, USA

Connated marker on a hiking trail

Walking trail on the Isla del Sol, Island of the Sun, in Lake Titicaca, Copacabana, Bolivia, South America

Hiking marker, hiking trail in the forest, near Scharnitz, Bavaria, Germany, Europe

Trail in front of the peak of the Grossglockner, National Park Hohe Tauern, Tyrol, Austria

Start of Alkali Flat Trail, a hiking trail, White Sands National Monument; Alamogordo, New Mexico, United States of America

Icon, information sign post at Cedars Mill Trail in Lynn Valley Canyon, North Vancouver, British Columbia, Canada

Wildflowers blooming along Tour du Mont Blanc trail, with mountain range and glaciers in the background, Val Veni, Aosta Valley, Italy

Male Hiker Sitting On Bench With Large Wooden Cross Overlooking Valley With Gren Meadows And Trees, Aschau, Austria

Sign On The Chele La Trail Marking Altitude; Bhutan

Rocks stacked neatly in rural landscape

Stone marker in Valley of Fire State Park, Nevada, United States, None, Nevada, USA