The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

The longest and widest floating bridge in the world.

A wall of chewing gum moonlights as collective art.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

A house carved into a rock in the 1940s.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

The historic tall ship is one of just three of its kind still sailing open waters today.

This private mansion turned Catholic bishop’s home is an iconic Galveston building.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

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

A beautiful geyser under environmental threat.

One man's ambition created this psychedelic log home.

At the time of its completion, it was the tallest dam in the world.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

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

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

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.