Secret refuge and museum of the Duke of Florence.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

Folklore and history carved into Brittany's coast.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Two small chapels housed inside an ancient tree.

The famous winding walk at Chartres is surrounded in mystery and myth.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

This bridge was constructed from the rubble of the infamous Bastille.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

Bohol's mysterious brown hills.