A gorgeous medieval library where the books are kept in chains.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The only museum with its curator—and her pets—buried inside.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The mummified relic of St. Catherine sits forever on a golden throne.

A diverse collection of wax, bone, papier-maché and mummified relics.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

The magic's in the hole!

A battle between nature and architecture in the Cambodian jungle.

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

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

A beautiful Victorian-era cemetery, complete with a miniature village.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

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

A spiral staircase twists to the top of this unusual Czech lookout tower.