This stone complex marks the urban center of a lost civilization.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

In the upscale neighborhood of Miraflores in Lima, a pretty little park is home to dozens of cats.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The place where Dvořák composed some of his most famous works.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

An interim housing alternative to FEMA trailers that is designed for densely populated areas during recovery and rebuilding following a natural disaster.

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

A formerly abandoned mental institute, now back in business.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

Where the Monitor was launched and ushered in the age of the "ironclads."

One of the first major shipyards in Brooklyn.

Constructed in the 1920s, this former pencil factory is now an office building.

Ornate "Renaissance Revival" style building.

Church featuring "high Victorian gothic" architecture.

2 square block factory in Greenpoint erected in 1936.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

While it now takes more than a dime to open an account this historic Brooklyn bank still displays the opulence of the gilded age in which it was built.

The graveyard holds the remains of Irish immigrants who arrived in Queens after fleeing the Great Famine.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

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

Site of the first pathological and bacteriological research facility in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.