ATHENS, Greece—Greece is reopening a major archaeological site on the tourist island of Santorini, which was closed for nearly seven years after a roof collapsed, killing a Welsh visitor.

The culture ministry said in a statement that the bronze-age town at Akrotiri will open on Wednesday, following completion of a new roof that shelters the entire site of the excavation from the elements.

The town was one of the main urban centers in the Aegean until its destruction by a massive volcanic eruption in the 17th century B.C. It was buried under ash and pumice, which protected and preserved the buildings.

Archaeologists have discovered four-story houses, remains of an advanced plumbing system and fine art and craftsmanship, including spectacular frescoes, vases and bronze vessels.