This museum dedicated to divination also honors a local 10th-century prophetess.

An eccentric inventor's castle home with its own indoor weather system.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A sophisticated astronomical tower built by one of the greatest Persian scholars of the Islamic Golden Age.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

An eclectic assortment of medieval architecture in a small Iowa town.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

A bizarre house filled with an astounding array of collections.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

The reason for the strange contortions in the trunks of these "drunken" pine trees in Russia is still a mystery.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

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

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.