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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

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

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

You would never come across this tiny green oasis if you didn't know it existed.

Christ's blood preserved in a Belgian town.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Giant topiary dog once played a role in a terrorist bomb plot.

The much-loved protagonist of famed Argentinian comics can be found sitting on a park bench.

The surviving remnants of a destroyed medieval church now stand in a public park.

An early 20th-century bullring converted into a modern shopping center.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

This replica of the Greek structure is in the heart of Nashville.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Rare recess caves fill this unbelievably beautiful Ohio park.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

An unassuming 13-acre park is home to over 12,000 roses.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."