The "Seinfeld" diner.

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

This candy-colored storybook village originated as a 19th-century Methodist campground.

The filming location of a shark attack in Steven Spielberg’s famous shark movie.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Destructive children, start your engines.

The land is home to swimming ponies and a legendary 18th-century treasure.

This mostly abandoned shopping outlet is now adorned with beautiful graffiti and murals.

An extraordinary "City of Caves" carved from solid stone.

The commemorative stone column conceals a secret laboratory.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

One part local history, 99 parts gruesome haunted house.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.