This quirky hot springs town known to locals as "T or C" was named after a radio show.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

This golf ball–shaped former desert real estate office now houses a UFO museum.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Limestone caves with spectacular showcase chambers.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

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

One of the oldest living oak trees in the Southeast.

One of the largest, oldest, darkest, quietest motel rooms in the world.

This massive redwood tree has a hole in the base big enough to drive through.

This free, take-a-book shop seems like a trick but isn't.

Moonbows over Kentucky.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The world's longest known cave system.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Enormous lake at the bottom of a unique cave system.

The ghostly remains of an accidental sea.