An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

A remarkable range of flora and fauna are represented in this Dominican nature preserve.

The first hospital in the New World.

Collection of fossils, plants, and ancient animals encased in amber.

A World War II-era submarine is stuck in the mud in New Jersey.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Step inside Lucy, the world's largest "elephant."

A unique sculpture park that specializes in the huge and bizarre.

An Irish Memorial commemorating those who perished due to potato blight.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

The oldest surviving botanic garden in the United States.

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

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.