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

This only museum in the world dedicated solely to mushrooms.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

Where the lovelorn find a home for their sentimental keepsakes.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

The encased skull that is widely believed to belong to St. John the Baptist.

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

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

Saintly bones pressed into a wax effigy of a Catholic superstar.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

A medieval military street hidden beneath a charming French fishing village.

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

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

The curious underground history of keeping Paris clean.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

The first green space constructed on an elevated viaduct.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.