This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

A reportedly haunted 14th century church is curiously facing the “wrong direction.”

Virgil's many-mouthed gateway to the underworld.

A former copper mine which became a truly unsuccessful prison.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The morbid items in this small and hidden museum are not for the weak stomached.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A haunting collection of the vanished and disappearing natural world.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

The English graveyard of Mineral del Monte, a magical little piece of Cornwall in Mexico.

Largest necropolis in the Mediterranean.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The small burial plot is located in a mall parking lot.

A 200-year-old prison that now houses a peculiar crime museum.