A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

The world's largest collection of intentionally useless inventions.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

An industrial site turned into Hungary's most cherished natural wonder.

These 13th century documents come housed in 18th century shelves organized by a 19th century historian.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

A perfectly preserved hill village where the buildings are painted like white lace.

An abandoned cable car station located on the Danube stands like a haunted house above the river.

The last stop in southeast Russia.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This hulking behemoth is actually five interconnected towers built in the 1960s.

An exquisite tunnel of cascading flowers.

This abandoned Brutalist treehouse is a hidden architectural relic.

A cableway for car transport.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

Coast along one of Japan’s mountain railways for coveted views of magnificent hydrangeas.