The longest-covered bridge in the state of Maryland.

This wildflower meadow was once the site of America's oldest operating paper mill and a symbol of Newark's manufacturing past.

The first marker along the famous boundary.

Two states disputed a square-mile slice of land for more than a century

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

Wedged between two sets of row houses is an awkwardly located family graveyard.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Alexander Hamilton’s creation caused quite a bit of controversy.

Trace the history of the nation’s early days at the site of America’s oldest stock exchange.

Believed to be the birthplace of the United States Marine Corps.

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

The world’s first penitentiary, meant to be humane, drove men insane.

Find your state fair food favorites all year long.

This beloved marketplace mascot poops money and grants good luck.

Yo, Adrian!

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.