I'm british but was visiting croatia. i hadn't had a drink because everything was shut but was out late and was lying on the monument to the sun listening to the sea organ at around 2.30 am with two guys i met in my hostel after we stayed up chatting and decided to go for a walk. i saw a red orb move erratically across the sky towards the south east across the coast. i suspected a drone at first but it shot off northwards at a phenomenal speed and vanished from sight. i believe from researching afterwards that an island north of zadar is a ufo hotspot. i live on a flight path in england so i'm familiar with seeing planes, this was unbelievably fast. its speed and direction wasn't consistent enough to be a shooting star or meteor - both of which i've witnessed in real life. i've also seen drones used professionally as i work for a fire service that uses them. this was way too fast. the other guys missed it, they were both spanish speakers and chatting away in spanish while i was resting. very beautiful town, lovely sunsets!