Yo, Adrian!

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

One of the oldest of its kind.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

In the early 1800s, surgery was also a show.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

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

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

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

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.