Christianity came late to Estonia, so a lot of the earliest churches date only to around the 1200s and contain pagan symbols inside. One of the coolest of these is the Kaarma Kirik. I have actually visited it twice, the first time because on the outside of the church is the oldest written example of the Estonian language. A plaque on the outside wall reads basically "In this year was this church completed. Peter and Paul in the year 1407." I went back to go inside the church to get a picture of one of the largest pentacles I have ever seen, and certainly one of the only ones I have seen in a church!