This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

A beloved horticultural oasis on the grounds of a wealthy family's former estate.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

A quirky collection of outsider art made from automobile parts.

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

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

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

Yo, Adrian!

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

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 failed piece of Orientalism has become the proud symbol of a community.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Dr Barnes' $25 billion private collection of art and arboretum.

This might just be the TARDIS of bookstores.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

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.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A layered tribute to the work of mosaicist Isaiah Zagar.