Spain's largest bullring offers a unique glimpse at architecture and history.

One of the oldest colonial buildings still standing in South America.

This artistic fountain display pays homage to this area's theatrical history.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

These lights mark the area of Rotterdam that was bombed and burned in 1940.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

A brutalist gem towering over the heart of Milan.

Constructed on the ruins of a convent, this tower saved countless lives.

This roadside memorial pays homage to Argentina's Outlaw Saint.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

Two panes of the massive Cold War artifact are on display at the National University of Singapore.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

A famed artist's inspiring work of peace and tolerance.

The oldest attraction in Disneyland is a prehistoric stump that Walt may have bought for his wife.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."