A perfect circle of 24 mysterious holes dates back to prehistoric times.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

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

The largest freshwater lake in the Florida Keys.

In the middle of the Alaskan wilderness, lies a train trestle to nowhere.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

"We Seceded Where Others Failed."

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.

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

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

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

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

A monument celebrating the idea of reaching inaccessible places.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

Deep into the lower floors of Pike Place, find a date with fowl fate.

This mile marker stands at the unofficial end of a highway built to defend the United States from a Japanese invasion during World War II.

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

The unusual patterns in this rock formation result from two distinct modes of weathering.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

Home of a 28-foot tall stalagmite known as the War Club.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

An abandoned coal mine reached by a steep hike.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.