Salute the leader of the proletariat.

A Manhattan Episcopal church with an eerie underground crypt.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Phil Mortillaro uses keys to bring art back to the Village.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Little Red Lighthouse under the George Washington Bridge.

Rummage through this sunken ship, but leave your scuba gear at home.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Relics given to a Manhattan church to avoid seizure by the Italian government.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

A bit of retro transportation flair preserved in the world's largest department store.

Visit the monolithic tomb of America's most famous general.

An artist's cute bronze subway sculptures belie his violent artistic past.

Cryptic messages embedded in the New York City sidewalk.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Wine bottle sculpture with a ship's stateroom inside.

Lie in a hammock where George Washington stood.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A living archive of urban activism and space reclaimed.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

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

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.