An architectural experiment in the Lower Ninth Ward, this row house is capable of floating as high as the Katrina floodwaters.

A prime example of New Orleans' unique architecture these early 20th century homes were built to look like steamboats.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This beautiful Croatian fortress is haunted by legends of forbidden love.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

This picturesque medieval monastery guards a small trove of historic treasures.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

Humble beginnings for one of the world's most famous scientists.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This extremely narrow tenement boasts a maximum occupancy of just two.

The world's biggest pet store.

A rare example of a German cemetery with traditional grave markers dating back several generations.

A museum honoring Germany’s cucumber mecca offers a great dill of gherkin history.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

The many—66 to be exact—faces of the German forest.

This enchanting mountain plateau celebrates spooky local folklore.

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

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.