This popular pitstop lives up to its name.

A church of bones, decorated with 40,000 human skeletons.

An ancient monastery, a locked room, and a mysterious book heist.

Tubing through a cave lit with glowworms is a magical underground experience.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

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

Thousands of well-dressed mummies below a monastery.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

A burial vault located under Tiber Island in the middle of the Italian capital.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

Historical figures from New York City's Catholic community reside in Midtown.

An unassuming corner inside downtown Orlando's library offers a whole new world of the park and its history.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.