Every year for the last three years, the Maine Historical Society (mainehistory.org) has held a one-day event on a weekend in May when they give lucky ticket-holders a chance to tour through areas of approximately ten different historic sites that are normally off-limits to the general public.
I've managed to go every year since they started, come hell or high water, and it's been great. Here are a bunch of photos from this year's tour on my Flickr page! I think I managed to get almost all of them labelled, but if you have any questions, please feel free to ask!
https://www.flickr.com/photos/darkbrilliance/albums/72157682286448194
Here are a few samples:
We paid a return visit to the clock tower on top of City Hall, voted in as the favorite from 2016.
We saw the lingering glory of a bygone era hanging in the now-empty WMTW-8 space at the Time & Temp Building.
We tiptoed up into the organ loft at the Sacred Heart Church.