As mentioned, Unity Temple - OP - FLW
My "church" as a kid - North Shore Unitarian
(Jim Freazier on Flickr)
The inset windows made it very easy to climb, the skylight unfortunately allowed our parents to see us up on the roof during service.
Web Site
And another very climbable church, from my hometown of Waukegan - St Anastasia.
Construction 1963
Land of LaLa flickr
1212 flickr