A miniature city, once ruled by the Queen of the Netherlands.

The first and only American institution dedicated to the enduring value of comedy in the United States.

The only remaining historic maritime signal station in the United States.

This candy-striped tower is the farthest east you can go in the United States.

This 19th century granite fortification is one of the most well preserved forts in New England.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

The world's largest rotating world.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The largest ancient burial mound in Ohio.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

In a city crazy for seashells this museum educates and amazes visitors using the wonder of cast-off exoskeletons.

This kitsch eatery is chock-a-block with bric-a-brac.

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

The former broadcast site has been reimagined as a museum about the medium.

An abandoned munitions factory with a shot tower continues to wage war on the surrounding environment.

A castle built by an eccentric medieval enthusiast in suburban Ohio.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A historic fort commemorating the United States' naval history.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.