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

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

World War II bunker still standing on the New Jersey beach.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

"Only the devil could play golf here."

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

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This is one really big nut.

Home of the International Space Hall of Fame.

A sharp bend in a dramatic river canyon cut through red rocks.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

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

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

The world's longest covered bridge is a quaint and incredible wooden tunnel.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.