The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

The only Native American museum along the Oregon Trail, run by the peoples who have lived on the land for generations.

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

An enormous park-like oasis, full of famous Chicagoans' graves.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

A 60-room castle constructed by a horse-racing heir.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

You must take the A train... to the last active cemetery in Manhattan.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A funhouse dummy that turned out to be a real life mummy, Elmer McCurdy is an urban legend come true.

The remote resting place of a notorious Wild West outlaw whose death is shrouded in mystery.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

A Wild West jailhouse that slid down the mountainside.

The notorious Wild West outlaw was raised in this unassuming abode.