What did the Romans ever do for Jordan? Well, yes, they conquered it a fair bit. But they built the city of Jerash. Yeah, OK, so they took the ancient Greek city of Gerasa, and made it bigger and better. Point is, two millennia on, said site, while ruined, is still magnificent – as unmissable a piece of Jordanian antiquity as Petra. It sits 35 miles (56km) north of Amman. Day trips from £43pp with Viator (uk.viator.com; reference 22721P17).