A historic coal mine that doubles as a museum and tourist attraction.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The world's largest fully steerable radio telescope.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

America's post-nuclear-attack chambers of Congress.

This natural wonder is disappearing at an alarming rate.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

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

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

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

The home, museum, and death site of Kodak's influential founder.

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

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This turn of the century masterpiece has a mysterious goaty interloper.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.