A collection of old steam and diesel locomotives sitting in a fenced-off garden.

Hidden deep in a forest is this geological wonder carved by glaciers.

The remains of a 19th-century school and living quarters are perched atop a mountain surrounded by a thick tropical forest.

Home to the world's oldest wooden building.

The ruins of this medieval castle now stand as a monument against all wars.

The recreated ruins of a house designed to memorialize a World War I shelling on the town.

This remnant of an ancient Persian city is considered to be the world's largest single-span brick vault arch.

A museum dedicated to the former country.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

A restored World War II Churchill Mark VII Tank now stands guard in Carrickfergus.

This infamous execution site inspired the beginning of Japan's modernization in the late 18th-century.

Abandoned in 2009, this once popular resort destination now stands frozen in time.

The largest cave in Northern Europe.

Heralded as one of the prettiest castles in all of Czechia.

A skeleton without arms watches over the side door of one of the most beautiful baroque temples in Mexico.

One in a pair of subterranean caves created by an ancient eruption of Mount Fuji.

Not far from a popular beach, an unfinished, abandoned mansion for Bulgaria's last communist dictator.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

This park pays homage to the region's rich industrial history of brick making.

An abandoned village that resides along the mountains of the Aosta Valley.

A rare example of an ancient Japanese hill castle believed to be the fortress of a legendary demon.

Veryovkina Cave is more than 1.3 miles deep—the deepest known in the world.

In this desolate valley resides a gorgeous set of rocks sporting a technicolor design.