The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A collection of artifacts from Maryland's maritime past.

Once America's tallest structure, now a Baltimore landmark.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

America's first federal monument.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

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.