Today I visited Mudurnu and Beypazari. The description says a little town (Beyparazi), but i would rather describe it as a city. The hill with the houses looks nice, you can walk there and do a nice walk, however the better walk is in Mudurnu. If I interpreted right, it is the plastre that should make it world heritage. Both have quite some similarities with Safranbolu by the way.
What I really enjoyed on the way from Mudurnu to Beyparazi is the scenery around Nallihan: beautifull coloured hills, really a joy for the eyes. This was the real highlight of my day.