I’d never looked closely at the Parachute Jump in Coney Island, but recently noticed the octagons at each vertex of the dodecagon 250 feet up in the sky. It really is a beautiful structure, but I’ll leave it up to you to decide whether or not it deserves to be called “the Eiffel Tower of Brooklyn”.
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I like the multiple takes on hexagons here, both in size and orientation. Not bad for random hotel wall art! This was in Cambridge, though, so maybe that explains it.
A new favorite building, on the West side. The strategic use and placement of non-congruent rectangles produces a pleasing result.
Playgrounds offer a seemingly endless supply of interesting mathematical apparatuses. I was rewarded on this particular day, seeing a regular tetradecagon for the first time ever.
Math Photo: Tetradecgaon © 2016 by Patrick Honner is licensed under CC BY-NC 4.0 
This cone sits in front of the engine of the SR 71 Blackbird, a retired long-range reconnaissance aircraft. Apparently this “spike” retracts into the plane at high speeds, to favorably alter the plane’s aerodynamic properties.