Image of part of the Doge's Palace in Venice. From one particular angle you could get the club patterns almost exactly in between the columns. To get it perfectly aligned I think the only place from which to do it would have been up a ladder in the lagoon! Needed a bit of straightening in Photoshop and a little tidy up.
Pentax K100D, Pentax 18-55m DA at 55mm, 1/350 sec, f/13