Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

One of the ghostly stops along Route 66.

A small space-exploration exhibit hidden in a hotel.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Water of undetermined depth has attracted rare fish and cult leaders alike.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Shoreline strewn with the remains of ghostly fallen trees.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

A museum displaying an impressive collection of pre-contact Makah artifacts.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

This airfield played a key role in both World War II and the Cold War.

Monument to the cotton-destroying boll weevil.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This spectacular track has run continuously since 1882.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

A saloon and inn that served the Wild West's most iconic figures—and is still haunted by some of them today.

An unconventional monument to one of America's largest landowners.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

The oldest continuously occupied public building in the United States.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.