A few dilapidated structures are all that remain of this deserted former silver mining town.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

Where the author wrote her beloved "Little House" books.

Where the writer penned his famous story about a jumping frog.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

Located within a historic park, the beacon is the oldest standing structure in Miami.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

A cemetery housing wild west legends in South Dakota.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

A mysterious stone embedded at the base of a historic Boston building.

Climb to the top of this spiritual tower, and you'll be rewarded with spectacular views.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

This lovely public park has an intriguing past and unique wooden bridges made of concrete.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

These massive mitts are made of 30 tons of devotional bronze.

Oldest building in California still in use.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A river with some unusual, and occasionally dangerous, habits.