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

A unique set of caves that spits waves back out into the ocean.

Race through the maze, get your name on the sign.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

The world's last remaining store of its kind.

With its vaulted ceiling and gilded details, this University of Washington library would feel right at home inside an old palace.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A mere dot on the map in the great north woods is the first place in America to vote in Presidential elections.

A serene plaza that commemorates one of the Granite State's most iconic figures.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Few of the many visitors to this resort town know of its hidden Maya ruins.

The highest point on the island known for buildings that touch the sky.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Elevated freight railway turned wildly successful urban park.

The site of Paul Revere's historic two lantern warning.

This working class sculpture pounds his hammer all the livelong day.

This former coal gasification plant found a curious second life as a popular public park.