The largest greenhouse in the world is home to over one million types of plants.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This giant wire frame man sculpture is crouched in contemplation.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

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

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

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

It houses the remains of a 17th-century version of the Titanic.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Hear the quietest sound from across the dome.

Famously misunderstood wonder of the ancient world

The sanctuary seems to either float atop the water or sink into the dirt, depending on the water level.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.