A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

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

This beautiful example of neoclassical architecture is one of Uruguay's most treasured cultural gems.

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

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

The resting place for anonymous victims of the Danube's dark waters.

Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Underneath the well-known Lindenhof hides a secret cellar documenting Zurich's early history.

Fantastic views and thousands of love locks.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Go surfing on this urban wave, "hacked" by local surfers.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

France's most famous cemetery, with some of its most curious tombs.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

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