This is How I solved it…
Started up with Identifying the Pillar
Enhanced the image using remini.ai then took cropped screenshot of different positions of the Graffiti (the red part, the green part and the dark green part), did reverse image search using Yandex and bing of all positions individually then came to an point where got the name of such Graffitis they were called “Urban tags”. After looking at them again started researching and found some similar graffiti discovered the language is german.
Started Investigating the Background
Removed the Pigeon using clipdrop.co/cleanup then begun to observe the image. After researching a bit found the texture of marble in the building is called “Calacata Purple”. Started doing Reverse image search using cropped image of the Marble (in the building) and added “Germany” as a filter with dorks.
Observed some results from “Czechia“ (Country in Europe and bordered by Austria to the south and Germany to the west), based on past research as the language of the Graffiti is assumingly German. I started to think I am going at the right direction, finally came to a point where I Matched a building with the same Marble as in the photo with the same lake view as well. Started playing with Google Earth and found a garden in front of that lake. As there were many pillars in the garden and many of them even had Graffiti it was a bit difficult to identify the one where the Pigeon was sitting. Found couple of street views and started to observe every pillar one by one observing the Graffiti and Camera Angle of the pillar, Finally located the exact place where the Pigeon was sitting!!
The Pigeon is at 50.08988656688333, 14.414370739295117, opposite to Manes Bridge, To be very Precise sitting on the 9th Pillar with Graffiti. The building in the background being Kosárkovo nábř 554.
Challenge by @unleasedosint – https://twitter.com/unleashedosint/status/1560197862268362752?s=21&t=WyC_Cmo9LW7ALMT4DwNiBg
Also received appreciation on Twitter from UnleasedOsint for completing the challenge first and with precise intel – https://twitter.com/saumaysrivasta1/status/1560256110132469761?s=21&t=WyC_Cmo9LW7ALMT4DwNiBg