All the ruined and lost cities have many things in common. 1 giant idols and places of sacrifice, ( alters ). But these mufsiduun who changed their holy books and hid the Truth from people are still busy misleading people. These devils ( called مغضوب maghduub in the Quran) call these sacrife places as theatres. These were never theatres, but alters where people will be sacrificed to these giants. Don't worry , there is the Day of Judgement which 5000 years long.