A unique botanical garden housed in three giant geodesic domes.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

An 1870s ranch for pioneers, rodeo stars, and divorcees was abandoned and left for dead, until the city reopened it for exploration.

Improbably, the largest wildlife refuge in the conterminous 48 states sits just northwest of Las Vegas, Nevada.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

Superfans of The Shawshank Redemption can take a driving tour of most of the films real locations.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

A relic of roadside lore and perhaps the first of its kind in North America.

Seth Bullock, the sheriff of Deadwood, built this town immediately after Teddy Roosevelt’s death in 1919.

The cliff and rock formations are made out of Sioux Quartzite.

An entire city block built completely out of petrified wood.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

A fitting attraction for the corn capital of the world.

Get up close to an F-4 Phantom flown in the Vietnam War at this Florida park.

One of the largest private collections of fossils in the world.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

Home to a giant switchblade and one of the world's largest collections of pocket knives, this museum is a cut above the rest.

The first declared National Monument in the United States.

The headquarters of a pioneering cast iron and cast aluminum cookware company is in ruins, but still standing.

The pan man stands as a testament to the functionality of American cast iron cookware.