This national landmark is also home to a massive treehouse.

A sycamore tree grown from seeds that traveled to the moon.

Since the 1930s, this Pennsylvania town has celebrated the humble tomato.

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

Considered by many to be a local landmark and treasure.

One of the world's oldest continually operating bookstores.

A park in a small Pennsylvania town is home to an original sculpture by one of its native sons, legendary artist and activist Keith Haring.

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

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

A beloved horticultural oasis on the grounds of a wealthy family's former estate.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

Narrow gorges and deep pools created by long-ago glaciers.

"Where the ducks walk on fish."

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

A museum of anything and everything Stooge.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

This collection honors the iconic, and proudly American lighter that just won't quit.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

Steepest flood safety railway in the entire world.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

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