A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

A hidden "place of interment for gentlemen."

A once grand hotel is being retaken by the wilderness it once capitalized on.

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

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

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

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

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

Yo, Adrian!

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.