Use a key to unlock this medieval sewer tunnel.

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

What happens when a sculptor has to find a way around a 100-year-old copyright.

The ruins of Vancouver's abandoned heritage railway.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This Late Gothic building that once housed Erasmus is now known as the filming location of "Suspiria."

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A vibrant, 100-foot-tall mural dedicated to Evelyn Nesbit, the tragic icon of the Gilded Age.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

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

Featuring the the longest lift span of any vertical-lift bridge in the world.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.