A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The unbelievably opulent home built for an infamous newspaperman.

Nancy Thompson's Home from "A Nightmare on Elm Street."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

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

The final resting place of a space program monolith.

Everyone remembers Laurie Strode from Halloween, but this is the house where most of the blood was shed.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Quite simply the largest tree in the world (by volume).

The ghostly remains of an accidental sea.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

A hand-built folk art installation covered with messages of God's love.

The rocks in this arid basin leave trails of movement behind them.

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

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

The location where the American Revolution ended.

A collection of vehicles across American military history.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

This estate on the banks of the James River was home to a Founding Father, two presidents, a famous bugle melody, and what some say was the actual first Thanksgiving.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.