An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Come for the speed, leave in love with the desert.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

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

The location along the shores of the Great Salt Lake of what was once called, "The Coney Island of the West", now sits barren due to arson and time.

A small flooded ghost town with a few scattered structures remaining.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Here, at the “world’s longest art gallery,” you’ll find forty miles of ancient petroglyphs and pictographs.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.

A much more welcome kind of snowbird vacationer, manatees camp out in these springs every winter.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

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

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

This former Indiana quarry has been transformed into a park and SCUBA site where divers can explore the drowned mining equipment.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.