Masonic architecture ping.
Here is another article with pictures:
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=1&set=0&page=0#ph1
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=2&set=0&page=0#ph2
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=3&set=0&page=0#ph3
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=4&set=0&page=0#ph4
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=5&set=0&page=0#ph5
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=6&set=0&page=0#ph6
http://www.pjstar.com/photos/x1173969084/OLD-MAIN-SECRETS?photo=7&set=0&page=0#ph7