I'll begin by saying that I don't quite believe in this stuff. I'm very sceptical about the existence of ghosts even after I experienced this.
For context: Mdina is Malta's former capital city. "Evidence of settlements in Mdina goes back to before 4000 BC. It was possibly first fortified by the [Phoenicians] around 700 BC, because of its strategic location on one of the highest points on the island and as far from the sea as possible. When Malta had been under the control of the Roman Empire, the Roman Governor built his palace there. Legend has it that it was here, in around 60 CE, that Paul the Apostle lived after his shipwreck on the islands. Mdina owes its present architecture to the Arab period, from 870 until the Normans conquered Malta in 1091. They surrounded the city with thick defensive fortifications and a wide moat, separating it from its nearest town, Rabat." (Wikipedia)
Once I was walking at night in Mdina, which is still a very eerie experience as Mdina is known as the Silent City; very few people live there and cars are not allowed within the walls of the city so there is hardly any noise and light pollution. Anyone one of the large houses had its front door open about halfway and as I was walking along I peered in. Inside were three elderly women seated around a table playing cards. Notably, however, they were walking clothes that would have dated back to at least the 19th century, although I am no fashion expert.
Probably just a bunch of old women wearing their great-grandparents' clothes, but you never know.
I have one more (even less tangible experience) and have heard one or two stories. I'll post them later.