One of the most extensive and well-preserved collections of dinosaur footprints in North America.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

A rocky shelter in the desert hides one of the largest concentrations of cave paintings in Mexico.

At this ancient settlement at the foot of Mount Babadağ, honeycomb tombs are carved into a round cliff.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Cave where bat-eating snakes hang down from the ceiling.

Located in Nairobi National Park, this animal orphanage is the oldest of its kind in Kenya.

A corkscrew-shaped barn in Ireland.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

Sleep in a glass pod dangling off a cliff.

A castle perched precariously over the Crimean Sea.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

The third version of this tall sailing ship sits, rusted and burnt, in Lake Ontario.

All that remains of the fishing-vessel-turned-warship is its weathered hull.