Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

A small Wyoming town is home to the state's oldest-operating soda fountain.

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

A popular rock that acted as a waymarker for American pioneers.

This rustic old building is said to be the most photographed barn in America.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Native Americans built this circle of stones, which was used to predict astronomical events.

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.

The first declared National Monument in the United States.

Three hundred years of preserved Spanish colonial history in San Antonio.

A 131-year-old wunderkammer of Texas history.

A mysterious inscription may hold a clue about the "Lost Colony" of Roanoke.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

This bar hosts an ever-evolving napkin art installation devoted to an American president.

"X" marks the spot of an echo chamber in the middle of a plaza.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

This quirky curiosity shop takes its cues from the world's bazaars.

The final resting place of the Seminole Indian chief who fought against government occupation in Florida.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

This natural spring not only claims to heal the wounded but it has also been willed to God.