These engineering masterpieces are a dominant feature of the Belfast skyline.

A series of stained glass artworks that depict images of the hit TV show.

A museum marks and documents the site of the Titanic's launch.

This flagpole ranks among the world’s tallest and can be seen from three countries.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Delve into the life of Edna St. Vincent Millay, harbor town history, and a quiet seaside garden at this charming library.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

At 207 feet, one of the world's longest continuous escalators.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

A former major munitions plant that has been converted into a sprawling art space.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

The world's brightest bioluminescent bay.

The narrowest house in America is seven feet of pure spite.

Opened in 1976, this monster-sized version of the fast-food franchise is sometimes called the Epic McD.