The only free-standing, vertical sundial in the US was keeping standard time before it was even invented.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A rapidly disappearing authentic bit of the old south.

An unfinished rail tunnel that has since been used to house cheese and bats.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

An abandoned town is hidden in Great Smoky Mountains National Park.

Elvis's own personal tropical hideaway.

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

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Mile-long cave system near Great Smoky Mountains.

More than five miles of underground passageways.

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

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Enormous lake at the bottom of a unique cave system.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

A man's home is his castle.

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

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

St. Augustine's record-setting narrow street was designed to protect against pirates.

A building so large that it has its own weather.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

A miniature city built by a single hunchbacked monk.