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

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Ghosts of France's colonial past.

An icy lake tucked among jaw-dropping alpine panoramas.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

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

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

A true Valhalla for cactus and succulent lovers.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

Incredible labyrinth of man made caves.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This cheeky statue of a man defecating gold coins graces the facade of a medieval guildhall.

These 18th century gardens tell a rocky story of the son of Odysseus.

"The most colorful grottoes of the world.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Ruins of a German Castle on top of a towering stone pillar.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.