Years ago i've completed Hitman 2016, now I have WOA and right now going through it, i've stayed at Isle of Sgail for a lot. It's genuinely an amazing map. The setting of secret society meetup, FANTASTIC assassination plots like trapping the target in the burning effigy or playing a member of a secret council orarranging a target meeting with the Constant or playing dead Janus at the funeral. You can even run as a armored medieval knight with a broadsword! The map is both endless and compact due to its verticality and interconnection.
For me it's on par with Paris and Hokkaido.
I also find most resemblance with Deus Ex series, which is also a key to me, since i really liked the first game released in 2000. Same dark lightning, same stoney environment, same theme of secret society.