One of the world's largest model railroads is a mind-boggling achievement.

A giant Troll lurks under one of Seattle's oldest bridges.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A local prank turned town icon.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A museum of anything and everything Stooge.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

This elaborate towering structure was once famed for its revolutionary height.

A daily replay of the experiment that proved the rotation of the Earth.

World's first "penitentiary," meant to be humane, drove men insane.

Yo, Adrian!

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This giant disembodied horse head seems to balance impossibly on its nose.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.