The site of the deadly Triangle Shirtwaist Factory Fire.

A terrific purveyor of natural history objects and curios.

These historic buildings once housed the headquarters of one of the most infamous gangs of New York.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

Spiral-bound community recipes and antiquarian gems mingle at this small East Village shop.

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

A celebration of capitalism in Midtown.

The home of the first American-born saint is one of the only curved buildings in New York.

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Unrepaired walls from a 1920 anarchist bomb attack.

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

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

The so-called "Statue of Liberty of Los Angeles" is on a one mutant mission to keep L.A. weird.

This stimulating sex toy museum is sure to arouse the interest of its visitors.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Historic funicular railway, believed to be the shortest railroad in the world.

A beautiful memorial tells the story of a formerly enslaved woman whose kindness shaped a burgeoning city.

The legendary building that needed ghostly approval before being built.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.