Going down for the third time...

This ruin was still intact this time last year, and it´s collapsed since. I´ve no idea what it is - or was. The story is that some time in this century someone from the Middle East turned up and bought a house (shown in extra), with this included in the property. He apparently hasn´t been seen since, and the properties show the signs of that. By shape the building in main looked like a theatre or a squash court but I really don´t know. I´ll put a different view of it in extras too.