The June Free Map is here, The Folly. The Folly is an architectural structure that generally appears to have been built for aesthetic reasons rather than a need. This particular folly is a fountain in the middle of a courtyard.
http://rpg.drivethrustuff.com/product/115112/The-Folly?affiliate_id=12615
Damn I thought this was The Folly from the Rivers of London series by Ben Aaronovitch.
Heh sorry to disappoint Mistwell. I wasn't even aware a novel featured the name The Folly prominently.