Here's the 50th map of the year:
...and a simple pdf battlemat version can be found HERE
Edit (see comments)
The whole tile is basically one long corridor on three different levels. If you enter from the eastern side you will descend a (20ft long) set of steps to a landing (A). From the landing you can head south down another set of steps, or head SE towards room D.
A simpler diagram:
So the wavy lines are there to show the different levels (if it were drawn without them, the South entry/exit would be almost black ...and not join with any of the other tiles very well).