OK, here's one MiG-21bis which stands as gate guardian at the main entrance into the 204th Air Base of Serbian Air Force (hence the black number 204 on the aircraft nose), here more commonly know as Batajnica Air Base by the nearby town of the same name. (Also this base is located some 10km off my home town Stara Pazova.) MiG-21 is closely linked with this place as the squadrons based here were first in former Yugoslavia to start to operate this aircraft in 1962 as they still do today.
This aircraft is nicely visible for anyone driving along the Belgrade-Novi Sad regional road. There's another gate guardian at the Gate No. 3, but this one is only visible from the inside. This second aircraft is G-4 Supergaleb advanced trainer.