Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

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

France's national museum of scientific and industrial instruments.

A surrealist timepiece by the artist of melting clocks.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A haunting collection of the vanished and disappearing natural world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This massive library holds what was once the largest book collection in the world.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The last permanent exhibit dedicated to the Soviet leader.

Pigduck of Turku.

Finnish lake, and scene of an infamous murder mystery.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

This lake-bound geographical marker sits at the point where three European countries intersect.

This fantastical icy castle is built anew every winter.

A historic scientific breakthrough that crosses nine borders.

Once standing on solid ground, this slender beacon is a victim of the very shoreline it was charged with announcing.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A model memorial to the original Odin Tower, the second highest tower in Europe before it was sabotaged by Danish Nazis.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.