A mysterious stone embedded at the base of a historic Boston building.

This historic patch of real estate offers a glimpse of colonial Boston.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Interactive museum complete with costumed re-enactors and the only known surviving chest from the Boston Tea Party.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

A grassroots community effort in the 1970s led to the creation of this beautiful garden full of delightfully whimsical exhibits.

Water flowed out of the town's unusual tree stump fountain in the 1930s, and the well still runs today.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

Jurassic Park—A Still Life.

It's easy to forget what century it is as you wander this rustic homestead.

A downtown park built on top of unclaimed graves.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The largest island on the great salt lake is home to curious creatures and strange stories.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Legends surround this jagged rock formation in the New Mexico desert.

This spectacular track has run continuously since 1882.

A hotel with a rich Wild West history of miners and bootleggers.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

A psychedelic tribute to one of Georgia's most unique artistic visionaries, out of place and time in the heart of Atlanta.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.