A tunnel with windows, so you don't miss out on the impressive views.

This 19th-century building inadvertently preserved the handprints of its builders within its walls.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Come crisp December nights, this fairly plain neighborhood becomes a holiday dream world.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

One of the ghostly stops along Route 66.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A vast array of tropical plants collected by a vacationing couple.

This aluminum airplane pays homage to the Flying Tigers of World War II.

A haunted hill that supposedly defied gravity.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Follow the steps, and this roadside artwork will teach you how to dance.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

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

Mile-long cave system near Great Smoky Mountains.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This stretch of highway is said to be haunted by ghosts of settlers whose graves were paved over.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

A sharp bend in a dramatic river canyon cut through red rocks.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Flip your own pancakes in this old sugar mill within a Florida state park.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

World's largest collection of Coke-related items not held by the Coca-Cola company.