All Saints church in Cambridge, opposite Jesus College. If there's one thing I like (that isn't trains or swans or Joanne) it's churches. This one has a fantastic painted interior and is currently being renovated by the Churches Conservation Trust. It's been closed for services since the 1980s and to get in we had to go to the nearby Spar shop and leave our names and a deposit to get the key then go through a brambly side gate and over a wood-pile to get inside. It was well worth it.