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

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

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

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

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

The last street in Pittsburgh that's paved with wood.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

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

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

The world's largest piece of copyrighted artwork.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.