Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

This former coal gasification plant found a curious second life as a popular public park.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

An abandoned stretch of elevated road in the middle of the Brazilian jungle.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Abandoned bridge hidden deep in the San Gabriel Mountains.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

An abandoned suspension bridge on the Falkland Islands is crumbling into the water.

At high tide this strange footbridge appears to have no purpose whatsoever.

Architectureal fantasy quarter of Rome.

This medieval hilltop village was abandoned at the end of the 19th century, after existing for more than 500 years.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

These quaint French houses dangle precariously over a precipice.

A fifth-century temple improbably built into the side of a cliff.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

This centuries-old Italian chapel hangs midway down a sheer cliffside.