How did I forget Forgotten NY's Subways & Trains page. Full of lots of goodies, including this item about NY's most unusual subway map, " a metal inlay on the sidewalk in front of the SoHo Building at 110 Greene Street, between Prince and Spring." It's 87 feet long and is 12 feet wide and was made by a Belgian artist in 1986. I'll have to check it out, sounds neat.