The world's first disc golf course has the Jet Propulsion Laboratory as a neighbor.

This field of concrete was once an active defense site armed with nuclear warheads.

Founded in 1873 to support the needs of the gold mines flourishing nearby, this is the last water-powered foundry in the United States.

One of the earliest and best-preserved buildings in Charles County, Maryland.

One of the first commercially successful anthracite-powered iron-making operations in North America.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

One of the few surviving original NASCAR dirt-track speedways.

This enormous abandoned factory is now a makeshift graffiti gallery.

A beautiful hidden gem in central West Virginia.

The crumbling remains of Juneau's explosives storage site.

This historic railroad hotel built from Kansas limestone was once the most popular hotels for traveling salesmen in the midwest.

Learn all about this iconic air rifle without putting an eye out.

Outside this souvenir shop is a statue of Bigfoot composed of volcanic ash, and plenty more to see inside.

Steel remnants of a bridge make up a unique sculpture along the banks of the Illinois River.

Located on the banks of the St. Lawrence River, this mansion is home to a massive art collection.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

The last water-powered mill in Oregon is open daily for free tours and has a surprising history.

One of the last-standing and most prominent structures from a long-lost colonial port community.

This once rural mansion now sits in the heart of the city.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

A tribute to the statues of Easter Island along Route 66.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

The headquarters of the semiconductor giant has a 10,000-square-foot museum.

A unique museum where guests can rent and operate a locomotive.