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

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

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

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

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

A private residence adorned with a gorgeous mural dedicated to the buzzing insect.

These medicine cabinet staples are part of the museum's collection of everyday objects.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

This historic furnace was once used to produce cannonballs during the Civil War.

This massive sycamore tree has been labeled as one of the largest in the state.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

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.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

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

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

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

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

Memorializing an American tragedy of massive proportions.

A diorama of the Civil War, fought by cats.

A retrofuturistic art installation in the Pittsburgh Airport.

Penn State's giant bug collection.