One of the first commercially successful anthracite-powered iron-making operations in North America.

This decommissioned surface-to-surface missile resides outside the American Legion Post in Pennslyvania.

Visitors to Salt Springs State Park are encouraged to literally put their two cents in Penny Rock.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

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

A museum and research center dedicated to preserving the history of Rolls-Royce and Bentley motorcars.

This stately 19th century library pushed architectural boundaries at a time when the public library movement was just taking off.

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

This roadside stand packs 300-plus varieties of tomatoes, from "Maiden's Fire" to "Kaleidoscopic Jewel."

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

The humble field where the first Major League Baseball game was played.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

Penn State's giant bug collection.

A retrofuturistic art installation in the Pittsburgh Airport.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

This icon of the Atomic Age now lays dormant.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

Where the "World Pinball Champion” is crowned.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

A unique workspace where offices reside on pirate ships and inside gingerbread houses.

Once used to screen films for theater owners to rent, this historic building is now a start up hub.

For decades, it has disappeared and reappeared as water levels rise and fall.