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

In this cemetery stands the country's first public crematorium.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

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

The site of America's first commercial oil well essentially disappeared after the town went bust.

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

Overshadowed by quilts, the artistry of these patterned textiles went underappreciated for too long.

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

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

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

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

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

The oldest surviving presidential residence in the United States.

One Pittsburgh musician's decades-in-the-making memorabilia collection is on display at this rock-n-roll curio shop.

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

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

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

This colonial mansion has been home to a staggering number of American historic figures.

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

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

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

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

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

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