Pittsburgh's literal underground railroad.

A beautiful oddities shop crammed with strange and morbid curiosities.

One Pittsburgh musician's decades-in-the-making memorabilia collection is on display at this rock-n-roll curio shop.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

A secret greenspace hides atop a Capitol parking garage.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A historic neighborhood church is reborn as a psychedelic arts collective.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

A little-known mural reveals the hydrological reason for Atlanta's founding in this location.

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

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

Yo, Adrian!

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.

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

One of Philadelphia's largest murals resides hidden under this bridge.

This beloved marketplace mascot poops money and grants good luck.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.