Tucked into Pittsburgh’s North Side, the Mattress Factory is a labyrinth of permanent, room-sized installations where artists transform entire spaces into mind-bending, immersive worlds.

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

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

Alexander Hamilton’s creation caused quite a bit of controversy.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

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

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

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.

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

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Mysterious rocks that ring musically when struck.

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

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

Where America’s first doomsday cult awaited the end of the world.

This giant Massachusetts sycamore is said to hold the dubious distinction of being the "widest tree East of the Mississippi!"

A stunning garden filled with fantastical environmental folk art and sculptures.

Climb the tallest remaining fire lookout tower in West Virginia for unparalleled views—if you dare.

This park is home to all 8 swan species, and also has extensive plantings of Japanese Iris.