UNESCO - Historic Center of Naples, Angioino Castle
I don't always recognise a UNESCO postcard unless the sender tells me it's a WHS site or it has been a pre-arranged UNESCO swap so with all my viewcards I have to google any details from the back in case it's a site I'm missing. With this official Postcrossing card it worked in my favour and I now have 'Historic Center of Naples' to mark off in red on my UNESCO Collection list.
The sender (the name isn't clear, unfortunately) just says that it's a card of Naples and its castle by the sea. However, on the description it says 'Napoli - The Maschio Angioino. Aparently this is situated in the Historic center of Naples, Italy which is a UNESCO site so, Hurrah! New card for the collection and a very nice one too.