The walls of the iconic dome are hollow and have a secret stairway.

There’s a hidden military meme engraved on the World War II Memorial.

A monument celebrating the idea of reaching inaccessible places.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

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

Yo, Adrian!

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Gold Rush-era tombstones line the park's paths.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

The fifth-longest natural arch in the world, and the longest outside China.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

The highest point in Washington state is a volcano covered in glaciers.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

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

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

One of the best places to see wild Colonial Spanish Mustangs in the United States.