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

As the oldest natural history museum in the Americas, these halls contain everything from dinosaur bones to biological samples collected by Lewis and Clark.

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

Dr Barnes' $25 billion private collection of art and arboretum.

The birthplace of the beloved colorful crayons right in downtown Easton

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

Yo, Adrian!

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

The oldest surviving presidential residence in the United States.

A collection of artifacts from Maryland's maritime past.

Once America's tallest structure, now a Baltimore landmark.

A Civil War Museum with some notable medical antiques.

This sculpture brings optical illusion to the roadway.

A history of the U.S. military, with a focus on Pennsylvania's contributions.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

These lush botanical gardens employ the most purrfect pest control force.

A secret, ethereal waterfall beneath the picturesque gardens.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Built into the side of Jack's Mountain, these steps were once the daily commute of local quarry-workers.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

This unusual rock formation in Berks County is nearly a mile long and may date from the Ice Age.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

Fiberglass geese standing 5 feet tall pay homage to the region’s love for the waterfowl.

A small granite block at this monument's base is the only part of Lincoln's Tomb outside of Illinois.