No one knows exactly how deep the world’s deepest geothermal hot spring is.

This high-desert oasis spotlights some of Colorado’s most sacred native plants.

This notorious dive has been serving up both kinds of spirits since 1879.

These murals from the 1920s beautifully depict America’s industrial age.

A once-thriving hotel from the Old West now sits abandoned, under the threat of demolition.

The metal bird, nicknamed "Sandy," stands nearly 40 feet tall and is an homage to the birds that migrate through North Dakota every year.

A replica of a fort built from a frontier town's mass hysteria in the face of false reports of impending Native American violence.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

Here’s how Robert the Doll earned his reputation as the most haunted doll in the world.

"We Seceded Where Others Failed."

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

The island residents are known for taking their quirky sense of humor with them to the grave.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

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

A historic presidential getaway on the continental United States' southernmost island.

A historic landmark and museum filled with curious objects representing the history of Key West.

These large-scale reproductions of Mario Sanchez’s colorful pictures and murals feel like a walk around a small movie set, and also lead you down an imaginary “street” of past decades.

Recently celebrating its 25th anniversary, the garden opened in September 1997 to celebrate the men and women who have had the greatest impact on Key West.

The highway's southernmost spot is a beloved local attraction.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A picturesque (all-natural!) beach in a landlocked state.

This depiction of the earth mother welcomes new life into Aurora Highlands.