A well-preserved example of an early industrial operation in the northeastern United States.

A sacred collection of indigenous rock art.

Outside a small brewery, a Gothic fountain that once provided water to thirsty horses.

Venture into the past with an unlisted exhibit hall featuring extinct birds.

Visit a fourth-generation farm and museum dedicated to everyone's favorite fungi.

Abandoned blast furnaces are an enduring reminder of Scranton's once booming iron business.

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

One of the few remaining covered bridges in Lancaster County.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

This national landmark is also home to a massive treehouse.

The lasting remains of the region's once booming cement industry.

Grand architectural relics gain a new life in this Pennsylvania warehouse.

A comprehensive collection of toy and model trains, largely from the mid-20th century.

One of the world's oldest continually operating bookstores.

Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

A wonderous place devoted to art and metal.

An abandoned incline railway site is now a green space with six acres of trails connecting hilltop neighborhoods.

Long before the Battle of Gettysburg occurred, dinosaurs roamed the area and left their footprints on this bridge.

The Ryerss mansion in Burholme Park now houses a community library and a museum filled with a trove of oddities from around the world.

Catch a ride through the Pennsylvania countryside on this historic narrow-gauge railroad.

A former plant in one of the hubs of U.S. steelmaking has been turned into this museum celebrating the history of American industry.

America's oldest drive-in movie theater has been in continuous operation since 1934.

The largest collection of Frazetta originals in the world.

These unique rock formations were created during the Ice Age.