This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A memorial to the first person killed by a motor vehicle in the Western Hemisphere.

There must be a pun in this haystack somewhere...

Two mermen, eternally spitting into each other's mouths.

A giant open-air sculpture made of over 200 full-sized boats.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Eight whimsical acres of metal art.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

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

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

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

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.

The site of the first "historically true" UFO encounter in the U.S.

It would take 35 firetrucks to fill this enormous glacial pothole.

Three acres of mythology-inspired sculptures are visible from the highway.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

The final resting place of the Hollywood star who came to a tragic end.