A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Home to the deepest rift anywhere on Earth.

Supposedly Satanic numbers adorn this preserved submarine sail.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Florida’s half-sized replica of the Vietnam Veterans Wall.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

One of the first intercontinental ballistic missile sites in the United States.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

Just a man taking his prehistoric pet for a stroll.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

Easily overlooked in favor of the wineries that dot the region, this blast from the past is equally worth the visit.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

Yo, Adrian!

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

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

One of the last active volcanoes on the Eastern seaboard.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.