One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

An easy to overlook storefront hides some of the most authentic and regionally diverse Chinese food in New York.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A classic carnival ride that was carved to be untouchable.

A line of blue paint marks the route of the inaugural parade.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The most accurate timepiece in the world.

This blue behemoth of a bear is a colorful homage to Brown University's mascot.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

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

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

The oldest continuously operating fish market in the United States.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

A super-sized promotional trick that is now a D.C. landmark.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.