While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The "lovely red Vega" of the legendary record-settling pilot.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This North Carolina store preserves a historic moment in America's movement for racial equality.

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

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The world's longest known cave system.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

A historic freight system that found the true gold rush is in tourism.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

One woman's dream became a train hotel in her backyard.

A Wild West jailhouse that slid down the mountainside.

A spiritual vortex among the red rocks in Sedona.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The failure of one component toppled this entire bridge during rush hour.

One of the few places where you can explore a 1918 paddlewheel steamboat from stem to stern.