With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The United States Capitol's former columns still stand.

This lovely little pond is named after the hundreds of soldiers' corpses that were rolled into the waters during the French-Indian War.

All that remains of the once-booming chain is a single orange-roofed restaurant.

A mysterious echo seems to defy the laws of acoustics.

The birthplace of the alleged inventor of baseball.

Fossilized sea bottom and lime quarry.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

Two mermen, eternally spitting into each other's mouths.

A beautiful multicolored mound formed by the mineral deposits of the Orenda Spring.

A tiny village in Upstate New York ushered in the precursor to drive-in movies.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

The small burial plot is located in a mall parking lot.

This sprawling taxidermy collection celebrates the art and history of sport hunting.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

An enormous cat made of recycled wood scraps.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

The shared home of a utopian commune that practiced "free love" a century before the hippies.

The statue honors the booming birds Rothsay, Minnesota, is famous for.

Man-made geyser that rises to the exact height of the Gateway Arch.

This monument claims to display the first pot used to cook a famed Southern stew.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.