The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

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

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

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

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

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

The oldest surviving botanic garden in the United States.

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.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

World's first "penitentiary," meant to be humane, drove men insane.

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

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

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