Croatia Cover Stamps

I received a letter from Croatia a few days ago. Affixed to the  envelope are four postage stamps from this country:

- The top-left stamp is part of a 2021 joint issue with Poland, featuring the Bochnia Salt Mine. 

- The top-right stamp shows the Solana Ston, which are salt pans in Croatia. 

- The bottom-left stamp  is a traditional embroidered pattern from the Šestine folk costume. 

- The bottom-right stamp features the Miljana Castle, a Baroque-style structure in Croatia.