(sorry for bad quality pic, but texts are readable enough)
Sveti Grgur (Italian: San Gregorio) is an uninhabited island in Croatia on the Adriatic Sea, between Rab and Krk islands. Sv. Grgur was the site of a political prison (then became a women's prison) in communist Yugoslavia from 1948 to 1988. Questo periodo è detto anche Informbiro, caratterizzato dal conflitto e scisma con l'Unione Sovietica di allora. Informbiro è il corrispettivo nome jugoslavo per il Cominform, abbreviazione per "Ufficio d'informazione comunista".
From far, on a hill of Otok Sveti Grgur, you could see the 4 letters T, I, T, O stamped on the ground.
The cache
It's a little black container with only a logbook. I please ask all geocachers, to try to maintain it, since I don't think I will come here again in the next years... Maybe it could last some paper to substitute the logboog once a while :) Thanks from now.
See this video, captured by myself exploring the walls of shame. At 3.33 you will see the cache's hiding place
https://drive.google.com/drive/folders/18p02xjiN16VaZuTloXZQ9XYzlr1WVDoD?usp=sharing
I also leave some pics of our stay on the island:
https://drive.google.com/drive/folders/1Z4qqmRp48-wA--XmmcI0tFVhA7227aHx?usp=sharing
Some links to know more about the island
in italian language
https://www.giorgioperlasca.it/i-campi-di-concentramento-di-tito/
http://www.storiain.net/storia/goli-otok-il-gulag-di-tito/
https://ricerca.repubblica.it/repubblica/archivio/repubblica/1992/06/27/scoperto-il-gulag-di-tito.html
https://it.wikipedia.org/wiki/Periodo_Informbiro
in english language
https://www.myistria.com/en/sv-grgur-goli-otok-a-detour-to-the-dark-side-of-croatian-history
https://croatiaundiscovered.info/en/blog/croatian-alcatraz/
https://en.wikipedia.org/wiki/Informbiro_period