These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Pop culture has helped to keep this iconic British building from being destroyed.

One of the largest underground systems runs under Canada's largest urban center.

This famous city eluded concrete detection until the early 2000's.

Hungarian mummies in beautiful painted coffins.

Museum dedicated to the terror regimes of Hungary.

Once the home of a hermetic monk, this cave now houses a small church.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

An out-of-place slice of France, smack in the middle of Shanghai.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The once highest point in China blends symbolic design with a kick of adrenaline.

Stunning Roman aqueduct used for 1900 years and still standing.

Turntable anonymously received orphans, alms, and groceries.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Cold war icon and onetime "hole" in the iron curtain.

A unique seaside cave where Aleister Crowley faked his own death.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

Living towers made of people that are now recognized by UNESCO.

The encased skull that is widely believed to belong to St. John the Baptist.

Science fiction's grandfather has a fittingly marvelous tomb.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Baroque celebration of the end of the Great Plague of Vienna.