Photo: Pavle Kaplanec
The pyramid in front of the Serbian Science Academy and Art building was set up there by the city of Belgrade in 1995. It has four pages and on it you can read the exact coordinates and altitude that the pyramid is located along with the increase in gravity velocity in that point.
One century earlier, atop the Kapetan Misin building there was also another pyramid with cardinal directions on it. This building used to be the tallest one in Belgrade and it was used by firefighters who were on duty to watch the cityscape for emerging fires.