London Underground Puzzle

London Underground Puzzle, originally uploaded by kenbod.

Our friends, Mark and Christine, gave us this puzzle of the London Underground when they came to visit us in Aarhus, Denmark last February. We finally got around to "completing" it this past week. I put quotes around the word completing in the previous sentence because this is where we stopped. All remaining pieces were pure white and required the brute force method to position. That took all the fun out of the process so we stopped and declared victory!