Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

A small Richmond island dotted with the remnants of hundreds of years of history.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

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

This small chapel is built of human bones and decorated with a golden skeleton.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

The first green space constructed on an elevated viaduct.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A museum of carnival attractions where you are invited to ride the rides.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The corpse bride of Portugal.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

Turntable anonymously received orphans, alms, and groceries.