A former military hospital is now used to study and preserve artifacts of the Acropolis.

In 1857, the Mardi Gras parade tradition began at this intersection.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A memorial for public executions that dates back to the 14th century.

These large-scale reproductions of Mario Sanchez’s colorful pictures and murals feel like a walk around a small movie set, and also lead you down an imaginary “street” of past decades.

Once a resting spot for King Fernando VII.

The most impressive of Basel's three remaining city gates.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

Recently celebrating its 25th anniversary, the garden opened in September 1997 to celebrate the men and women who have had the greatest impact on Key West.

A gruesome combat between a hunter and a furious momma bear.

Dedicated to the Father of the British Fire Service.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

A brother statue swap has adorned this building's facade for centuries.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

A hidden courtyard houses early 20th-century plaster masterpieces.

This outdoor mural is one stop on a walking trail that weaves art and history together to tell a tale of local history.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Along the banks of the River Rhine lies a park that seems unassuming, but beneath the surface lies a long and fascinating history.