Red frames showcase remnants of one of New York's original subway stations.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Become a prohibition rebel.

Harlem park dedicated to compulsive hoarders killed by their own junk.

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

Elevated freight railway turned wildly successful urban park.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

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

A celebration of capitalism in Midtown.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

A dilapidated dock tells the story of Titanic's missed arrival.