The prototype for all Nazi concentration camps.

Copenhagen's celebrated theme park and gardens.

The second oldest continuously operating bar in Louisiana.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The world's most important buildings shrunk to a tiny size.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A floating museum that was sunk by a flood and left to rot in the tides.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A serious museum dedicated to two German comedians.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

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

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

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

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

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Cold war icon and onetime "hole" in the iron curtain.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.