The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

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

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Some of the smallest works of art in existence.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

A New Hampshire grave with a grudge.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

An unusually designed bridge from the 1920s was built to withstand the tides and winds of Maine.

This 90-year-old building is home to possibly the most New Englandy social club in existence.

This historic mini-suspension bridge was swept away once but is now here to stay.

A former zoo turned public park, where visitors can hang out in the old animal cages.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

The site of Paul Revere's historic two lantern warning.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The "dragon babies" of southeastern Europe.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

Now harmless, this looming post struck fear into the heart of medieval troublemakers.