A large courtyard surrounds Matthias Church on the Buda side of Budapest with a walled and a towered structure directly behind named Fishermen’s Bastion. The view from the tower is spectacular looking eastward across the Danube to the Pest side. Shortly after descending the stairs I stopped to check some photos I had taken and happened to glance down and spotted this circle in a square. As you can see it is dated 2014 so recently installed.
ISO 100 Focal length 17mm Aperture f/5.6 Shutter speed 1/160