Venice’s Jewish ghetto, considered the first in Europe and one of the first in the world, is seeing a new effort underway to preserve its 16th-century synagogues for the faithful who have remained as well as the tourists who visit. For nearly two years, restorers have been peeling away paint and discovering the original foundations of three of the ghetto’s synagogues -- believed to be the only Renaissance synagogues still in use -- art historian David Landau said. Landau is spearheading the fundraising effort to restore the synagogues and nearby buildings both for Venice’s small Jewish community which numbers around...