Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.

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

Two stone columns flank the grand Venice square, but there were supposed to be three.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

This monumental work of art symbolizes the coming together of a previously divided city.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

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

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

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

Tiny memorials honor individual victims of the Holocaust.

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

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A monumental golden thumb rises as an iconic homage to Nouveau Réalisme, bold in scale and unapologetic in spirit.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

A larger-than-life monument to the inventor of the Bunsen burner.