A few weekends ago I happened on this window while wandering around Brooklyn. Do you know where this is? Still stumped? Hint: I recently tweeted about it.

Log in and leave your guesses below and check back on Monday for the answer.

UPDATE 4/23/12: The Brooklyn Library was a good guess, but not the right one. This window is part of Skylight One Hanson, in the ground floor of the former Williamsburgh Savings Bank where the Brooklyn Flea is held during the winter.

Lyndsey Matthews is an assistant digital editor at Travel + Leisure. Follow her on Twitter: @matthewslyndsey