A massive sea stack famous for its appearance in The Goonies.

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

Eco-friendly island mansion.

A 60-room castle constructed by a horse-racing heir.

Symbolic attempt to overcome the issues of life.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

Taking the 3D art experience far beyond blue and red glasses.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Oldest building in California still in use.

A Beaux-Arts triumph set to become Ford's innovation campus

An office built to look like a giant basket.

The world's longest known cave system.

100-year-old shipwreck you can walk up to at low tide.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This striking art museum holds an amazing series of curiosity cabinets.

This historic tower in the California desert promises visitors a "vortex of good vibes".

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A museum dedicated to the history and exploration of both popular music and science fiction.