An unusual sight in the Old City of Dubrovnik this afternoon as a swarm of bees invaded. Tourists reached for their cameras as the bees first flew in a circle above the historic facades and then collected on the stone wall of the Dominican Monastery.

It is unsure where the bees came from, or indeed why they collected on the wall of the monastery. “In all my years I have never seen anything like this, it looked like an invasion when they first appeared,” commented a local shop owner on the Stradun for The Dubrovnik Times.

Check out the video!