The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Go surfing on this urban wave, "hacked" by local surfers.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

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

A stairway to heaven, or to nowhere at all.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

Beloved children's TV characters freckle the German city's streets.

This small window display is dedicated to the noble carrot.

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

This former steel and coal plant is now a neon-lit industrial fantasia.

This "floating railway" is one of the world's oldest monorail systems.