2 Best Sights in The Algarve, Portugal

Near the marina, the excavations of Roman ruins at the site known as Cêrro da Vila (where Vilamoura was first established), have revealed an elaborate plumbing system as well as several interesting mosaics. The small Museu de Cêrro da Vila gives you access to the site.

The ruins at Milreu, about 10 km (6 miles) northwest of Olhão, were first excavated in 1877. The settlement once known as Roman Ossonoba—including a temple (later converted into a Christian basilica) and mosaic fragments adorning some of the 3rd-century baths—date back to the 2nd through 6th centuries.