A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

Volunteer-run library dedicated to exploring five decades of activism history.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

This ancient theater was once the home of fierce gladiatorial battles.

Whether hero or rogue, his silver bullet is said to have taken down the murderous "Beast of Gevaudan."

Site of one of World War I's most horrific scenes.

The world's most famous cheese caves.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

Since ancient times these picturesque springs have been providing bathers with healing waters.

Figures of unknown origin carved into the surfaces of underground caves.

An icy lake tucked among jaw-dropping alpine panoramas.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

The Sun King's military models, saved from the Louvre.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

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.

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

Abandoned railway line circling the city of Paris.

A sunken idol welcomes parishioners to Davy Jones' Locker.

Pilgrimage site for star-crossed lovers.

Ruins of a 10th century church tucked away deep in a botanical garden.