New York is no stranger to jaw-dropping architecture, but The Big Bend may be the wildest concept yet. Proposed by Athens- and NYC-based Oiio Studio , this U-shaped skyscraper would quite literally loop over Midtown Manhattan like a gravity-defying rollercoaster. At 4,000 feet in total length, it would not only tower over the competition—it would become the longest building in the world.

Designed to arch high above Billionaire’s Row on 57th Street, The Big Bend would top out at 2,000 feet, making it taller than One World Trade Center . But height isn’t the only headline here. Instead of going up and up like its super-slender neighbors, this one bends over itself in a giant architectural horseshoe, connecting two towers at the summit in an elegant (or unhinged?) curve.

So why bu

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