The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This black shoreline is made up of exploded lava particles.

One of few remaining antique carousels with stationary animals in the U.S.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

When ecosystems collide in the arid Southwest.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

What is the Thing?

A giant Troll lurks under one of Seattle's oldest bridges.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

The United States Capitol's former columns still stand.

A walk through the historic city center, under the streets of Seattle.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The rocks in this arid basin leave trails of movement behind them.

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A huge musical instrument played by the ocean.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.