(research.)  …get a crazy answer. Can you make some magic tubes that bring natural sunlight down into an abandoned subway terminal, sufficiently to permit photosynthesis in plants and transform the space into the world’s first underground park? The answer may be yes. If it’s possible, it’s going to be possible in New York City. And if you find it, you’ll find it below Delancey Street at the western end of the Williamsburg Bridge. One day, anyway. Seriously, the Lowline could change a lot of things. It’s an important experiment. >> Ryan Gravel

Learn more about the Lowline.

Map it: Essex Street Station.