This museum inside a museum tells the story of London's timepieces.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Every president in history is immortalized in bronze in downtown Rapid City.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

This former limestone quarry is now a subterranean wonderland of grand stonework.

A huge musical instrument played by the ocean.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

A museum within a museum, devoted to history's most questionable medical devices.

European castle ruins in an American state park are actually the product of death and grief.

Three wildly colorful calderas top this otherworldly volcano chain.

An Italian geologic wonder that served as the inspiration for the landscape of Dante's hell.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

A small, but award-winning beach known for its literally spotless reputation.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

This medieval church tower has maintained its clockworks since the 16th century.

A sculptor's dream castle turned fantastical ruin.

The fairy tale castle of the "fairy-tale king."

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

The best-preserved Roman small town in North Africa.

One man's desire to transcend art led to the construction of this outsider chapel.