A true roadside icon standing on the same plains that the herds once roamed.

The last remains of one of the oldest and largest oak trees in the United States calls this state park home.

This is the last surviving Bollman truss bridge in the world.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

The smallest covered bridge in Maryland.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Once an exclusive hunting club for U.S. presidents, now a wildlife conservation area.

One of the first intercontinental ballistic missile sites in the United States.

Once a slice of Cold War-era military history, this museum is finding its future in the stars.

America's largest man-made forest was planted in an effort to bring back the past.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

Otherworldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

Visit the century-old plant nursery that grows trees from space.

Meet cowboys and ancient beardogs at this one-of-a-kind crossroads of Western history.

This Harriet Tubman mural went viral for kids interacting with it.

Near the state border, cars seem to defy the laws of physics by rolling uphill.

At the birthplace of American railroading, a world-class collection of historic trains.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.