Abandoned bull fighting ring, slowly falling apart in Uruguay.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

Where the lovelorn find a home for their sentimental keepsakes.

A bright little alley in La Boca is a part of tango history.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

A memorial to the victims of Argentina's "Dirty War."

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Elevated freight railway turned wildly successful urban park.

Macabre astrological automaton clock dating to the late 1400s.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

Museum dedicated to the terror regimes of Hungary.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Unusual building appears to be haphazardly built from randomly piled bricks.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

Ancient serpentine sacrifice holder that has stood the test of time.