If you're looking for a unique Maine adventure that really dives deep into Maine history, you may want to consider visiting Flagstaff.
According to Wikipedia, the ghost town of Flagstaff is located about 20 miles North of Rangely. But, if you are planning a visit, you'll want to bring your SCUBA gear... The town is dozens of feet of water!
The first settlement in the area was constructed during the Revolutionary War, when Benedict Arnold camped there during his expedition to Quebec. While they were camped at the site, Arnold's men put up a flagstaff (so they could fly a flag). That fairly normal featured led to the name of the town.