The city of Lvov in the Ukraine is home to the world’s largest crossword puzzle.

Clues to the crossword are scattered around the city’s major landmarks and attractions including parks, fountains, and theatres.

Although the crossword – which is 19 squares across and 34 squares high – is far too big to be filled in by hand, the artists responsible have come up with an intriguing way of displaying the answers.

When night falls, fluorescent letters placed inside every square are turned on, revealing the complete solution in a light glow

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From the Upcoming ueue, submitted by Frau.