The ghostly remains of an accidental sea.

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

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

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

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

A museum dedicated to the alleged Roswell Incident.

Odd outsider art installations surround a Gold Rush-era ghost town.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The world's longest known cave system.

One person’s lost luggage is another person’s treasure.

A beautiful geyser under environmental threat.

This abandoned amusement park was built on a site with a dark history.

The first declared National Monument in the United States.

Home to items never before seen by the public.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A museum dedicated to the history and exploration of both popular music and science fiction.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Enormous lake at the bottom of a unique cave system.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A walk through the historic city center, under the streets of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.