Hidden by the roadside in the Iya Valley, this gem brings together folk monsters and the region's unique geography.

Art Nouveau painter Alphonse Mucha spent 18 years creating these monumental paintings of Slavic history and mythology.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

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

Thousands of well-dressed mummies below a monastery.

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

Ancient catacombs form the foundation for this Rococo orgy of a church.

These lesser-known Maltese catacombs date back over 1,700 years.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

A neo-Gothic temple in central Mexico featuring a labyrinthine network of crypts.

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.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

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

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

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

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

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

A striking bronze sculpture of a Roman goddess with two hound dogs for company.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

A 16th-century horror show built in a lovely Italian garden.