The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.

The fairy tale castle of the "fairy-tale king."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Go inside to really appreciate this 500-year-old technological masterpiece.

A chapel on a volcanic core, marking the end of a successful journey.

Series of underground houses inhabited continuously for centuries.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

These spooky and unusual stone formations create an underworldly landscape.

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

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

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Art and a pun, all in one.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A slice of central Asia in the middle of Berlin.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

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

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.