A temple to modernity, tucked away amid Barcelona's more well known museums.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The land is home to swimming ponies and a legendary 18th-century treasure.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

Baroque celebration of the end of the Great Plague of Vienna.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

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

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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

Yo, Adrian!

An Irish Memorial commemorating those who perished due to potato blight.

World's first "penitentiary," meant to be humane, drove men insane.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A mysterious echo seems to defy the laws of acoustics.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.