The underground sanctuary of a mysterious ancient cult.

The glowing blue Nymphaeum of Emperor Tiberius.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Architectureal fantasy quarter of Rome.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

An alchemist's "magic door" stands in the middle of a Roman park.

A submerged archeological park still holds the wonders of a Roman Sodom.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

Twelve natural mummies are displayed in the crypt of this former monastery school.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Frida Kahlo's childhood home, now a museum of her life and works.

Part bookstore, part café, and part forest.

66,000 pieces of art, donated by one of the world's richest men.

A church dedicated to the Mexican skeleton saint.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

This Orthodox Church's exterior is rather unorthodox.

Nondescript elevator doors open to reveal a stunning, surreal world.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

Holding the most bodies of any cemetery in the United States.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.