The old city center is a labyrinth of narrow, winding streets and lanes.
labyrinthos (maze, large building with intricate passages) (Greek)
lab+yrin (wiring)-its is complicated network of paths kind of MAZE Break this word as LAB+YRIN (wiring)+'n'th. Generally in maths we use 1, 2, 3, 4, . nth term. So statement is "There are so many (n)wires in the LAB which leads to complexion. --> which is the meaning.