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

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

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.

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

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

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A celebration of capitalism in Midtown.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

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

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

The only town in the world with two exclamation points in its name.

A massive Montreal stadium that has seen nothing but trouble since its inception.