Huge masonic hall in Philadelphia with lavishly themed rooms.

The oldest surviving botanic garden in the United States.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

A trompe-l'oeil statue honoring the first guide dog in North America.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

Filled with history, this cemetery is maintained each summer by a few hungry goats.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

On the Hudson resides one of the largest clocks in the world.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

A whimsical monument deep in this park commemorates the groups that helped build it.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Marie told fortunes from her small stand on the Boardwalk for decades, including to a young Bruce Springsteen who would busk outside her booth.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

This old-fashioned candy shop, ice cream parlor, and diner served as the setting for one of TV's most controversial series finales.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

A unique sculpture park that specializes in the huge and bizarre.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.