Giant granite rocks standing end-to-end like a train of circus elephants.

Rusted and decayed, this former mining site is a portal to the past.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

The wooden airship was the largest flying boat ever built.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

Home of Howard Hughes' Spruce Goose.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The secret city built by the Manhattan Project.

This hotel was used during the Manhattan Project to house official visitors.

The physical legacy of one man’s lifetime mission, following a near-fatal mine accident, to publicly proselytize for Christianity.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

This former Cold War missile control site played an important role in the creation of GPS.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

Recorded as the first person buried in Arlington Cemetery.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The house where John Wilkes Booth conspired with his co-conspirators.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.