This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

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

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This handsomely carved wooden church is more than 800 years old.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

The cutest way to stay safe in traffic.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The most playful of the life-sized statues that make up Singapore's "People of the River."

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's landscaping project is home to 18 incredible Supertrees.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

The library's graceful rotunda is like a bibliophile's temple.

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

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.