This is the Pula Arena (or amphitheatre, or coliseum), in the Istrian city of Pula, Croatia. Built in the 1st C. AD, it’s the sixth largest of 200 surviving Roman arenas. The last time I visited here was 32 years ago.
Well maintained these days, at its peak it was able to accommodate more than 20,000. There’s a nice little museum on the premises (admission 40 KUN/EUR 5.53/USD 8.16/), an absolute must stop.
The rest of my personal dandy dozen or so from the month of May, shot in Losinj, Croatia, and various spots around Slovenia, are here.