This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

The colonial city's social history is reflected in its fanciful door knockers.

The world's first ice hotel is still one of the most elaborate and beautiful.

A terrific purveyor of natural history objects and curios.

It houses the remains of a 17th-century version of the Titanic.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The most confusing clock in New York.

Three-story slide through the New Museum.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The greatest real estate coup of all time.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Little Red Lighthouse under the George Washington Bridge.

An artist's cute bronze subway sculptures belie his violent artistic past.

Rummage through this sunken ship, but leave your scuba gear at home.

A popular European tradition makes its way to the states on one of America's most famous bridges.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Avoid gangster interaction while window-shopping.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.