I won the vintage postcard (above) printed quite some time ago in a lottery :) It shows the peristyle of the Diocletian's Palace in Split. Diocletian's Palace is a Roman palace that was built by the Roman emperor Diocletian at the turn of the fourth century AD. Diocletian built the massive palace in preparation for his retirement on 1 May 305 AD. It lies in a bay on the south side of a short peninsula running out from the Dalmatian coast, four miles from Salona, the capital of the Roman province of Dalmatia. The terrain slopes gently seaward and is typical karst, consisting of low limestone ridges running east to west with marl in the clefts between them. It was added on the UNESCO's WHS list in 1979.
I've just realized that this is my 250th post on the blog! I have really overlooked it, because I was planning to hold a lottery in order to celebrate this, but will have to wait for another occasion obviously. Anyway, thank you, Nenad!