This historic hotel invented the chocolate brownie.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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

This beloved marketplace mascot poops money and grants good luck.

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

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

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

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

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

Yo, Adrian!

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

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

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

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

This award-winning men's bathroom was just too beautiful to not allow women to see.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

Once America's tallest structure, now a Baltimore landmark.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A museum dedicated to exhibiting remarkable outsider art.