Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Ancient and modern architecture are joined in Louis Kahn's monument to democracy.

This striking, two-toned confluence of rivers is visible from space.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

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

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The "Prussian Versailles" that is as glorious today as when it was built.

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

The patron saint of spinsters grasps a container of dried blood.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

The prototype for all Nazi concentration camps.

This historic stone bridge has an entire neighborhood clinging to its sides.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

What once sat in the world’s spotlight is today a largely disused ghost complex.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Where commuters walk through remnants of an ancient Greek necropolis.