Giant Crossword Puzzle in Lvov, Ukraine

This giant puzzle fills the side of a housing complex in the city of Lvov, Ukraine. By day it appears blank but the answers become visible at night. Questions to the puzzle are scattered about the city in different points of interests to travelers and citizens alike. I can say I'd not only love to see this first hand, but I'd be delighted to call this building home.
(Found via Design Boom)