Rare recess caves fill this unbelievably beautiful Ohio park.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

Rustic natural hot springs in the deciduous rain forest.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

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

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

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

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A whimsical village of unique treehouses resides in a Washington forest.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Hollowed out cedar log tubs set in an ancient towering forest.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

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

Towering basalt columns, a creation of fire and ice.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

This frequently-photographed waterfall takes only a short hike to visit.

Take a drunken tour inside the world's largest known geode.

An underwater city for the dead.