I takes only 1 euro to visit this little church in the Tallinn old town. Pretty glass paintings on the windows, peaceful atmosphere and interesting things to see.
The inside of the church is really run down, but makes for great pictures and understanding of how the church changed over the various wars and times. Small admission fee required.
I came here specifically to see a commemorative wall plaque of my friend's Great Uncle who was killed in the E-18 submarine in 1916. A nice peaceful church, very old and original.