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 was finally completed in 2026—a century after the death of its architect.

Yo, Adrian!

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

The 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.

One of the indelible moments of the American Revolution took place at this location.

This abandoned factory on the Hudson River once churned out a million bricks a week.

This abandoned ironworks was once the most important military supplier in America.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Teddy Roosevelt’s famous “midnight ride to the presidency" started at this small lake high up in the Adirondacks.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

North America's largest accredited model railroad museum.

The ruins of the castle that chemicals built.

California's oldest wind harp represents a historic piece of America's Danish history.