Europe's second largest ossuary wasn't discovered until 2001.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

What was meant as an innocent piece of art has earned a reputation as the "mansplaining sculpture."

Climb down into the largest sinkhole in Qatar.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

The largest known medieval map of the world.

An enormous, inside-out glass globe built in 1935.

Journey through a collection of over 35,000 Halloween items from all generations.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.