Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

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

Visitors come from all over to bring gifts and tokens to the grave of Alice, who is thought to have died of a broken heart.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The maritime museum that boasts the largest nautical library in the western hemisphere.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

San Diego's most historic and haunted home.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Home to three historic ships from the age of Vikings.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A former major munitions plant that has been converted into a sprawling art space.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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

A downtown park built on top of unclaimed graves.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

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

Breathtaking and huge 430 year old maps of Italy.

The Pope’s secret escape route.