On my way from Helsinki to Riga last week I stopped in Tallinn and took some pictures of TAR locations.
The door at Mustpeade Maja, House of Blackheads
Pikk Hermann Tower Garden, the box was located somewhere in this area and I don't blame teams if they had difficulties to find the box because the garden is surrounded by fences so it looks closed even though it isn't.
And the tower itself. The pink building is the Parliament of Estonia.