These unusual rooms on wheels are holdovers from the 1960s.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

Crumbling pink walls and murder memorials preserve the pioneer history of Joshua Tree.

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

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

One of the most unusual geological features, recognizable from a dozen hit movies.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Massive prehistoric mammals used these stones as oversized scratching posts.

The only visible piece of San Francisco's most famous shipwreck.

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.

An abandoned convention space that has been left to the homeless and the radical.

Concrete strongholds stand guard over the Golden Gate.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

Decommissioned experimental solar facilities that pioneered solar energy technology.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

Legends surround this jagged rock formation in the New Mexico desert.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.