This elaborate towering structure was once famed for its revolutionary height.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

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

There aren't too many operational funiculars around, but Pittsburgh has two!

The oldest farmer's market in America is so ancient it was approved by the King of England.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

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.

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

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

Mysterious rocks that ring musically when struck.

A layered tribute to the work of mosaicist Isaiah Zagar.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Pluto is still considered a planet in Ithaca, New York.

This former hub for crafty philosophers was founded by a writer who died aboard the infamous RMS Lusitania.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

A 19th-century architectural wonder designed by the "father of the skyscraper."

The absurd creation is a compulsory destination for selfies in Buffalo.

This vessel is believed to be the oldest operating fireboat in the world.

Ruins of a once-prized railroad station in New York.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

This massive melon is a recreation of a similar gate from the Pan-American Expo.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.