A massive volcanic plug is now a protected area that hosts a number of bird species.

Golden Gate Park's historic collection of plants.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

One part local history, 99 parts gruesome haunted house.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A beautiful geyser under environmental threat.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The celebrated eyesore created by starry-eyed sweethearts.

A motel dedicated to Southwestern nostalgia.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Exact replica of the ancient monument, but much, much lighter.

Less a museum than a bizarre fantasy world created by artists and engineers.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Nature's biggest mammal swims in landlocked Oklahoma.

Step inside Lucy, the world's largest "elephant."

The land is home to swimming ponies and a legendary 18th-century treasure.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A hidden alley in urban Baltimore is a haven for graffiti artists.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.