The Vermont grave of a 4,000-year-old mummy prince.

A tomb with a window to ensure the interred wasn't buried alive.

Underground monastery and fortress.

A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

The oldest continuously inhabited street in America.

100 massive sculptures in the Hudson River Valley.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

New York City's smallest piece of private property.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

An extensive collection of fine art devoted to man's best friend.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A big museum full of little worlds.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

This is not your typical jungle gym.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Medical history museum featuring a lovely doctor's office from the 1800s.