In Milan on Wednesday, attendance was down at museums, too. Under the regulations, museums must also limit their capacity to make sure the one-meter rule can be enforced. But, at the Novecento, there was no need to turn anyone away.

A staff member at the ticket kiosk said that, by just after midday, only 28 people had been admitted to the museum.

At the Palazzo Reale museum next door, 160 visitors were admitted by 1 p.m. on Wednesday. According to a staff member at the ticket desk, the usual daily average is 1,000.

Daily attendance across Milan’s museums was down by 70 percent, Filippo Del Corno, Milan’s chief culture official, said in a telephone interview.

Italy’s culture ministry analyzes attendance at museums and archaeological sites on a monthly basis, so numbers for the whole country were not available on Thursday. But contacted individually, some of Italy’s top tourist draws were noting dramatic drops in visitors.

The archaeological site at Pompeii has seen an 80 percent reduction, a culture ministry official said. The Uffizi in Florence continues to register between 1,000 to 2,500 visitors a day, “about the same as a normal day in low season, which this year is likely to continue through March and April,” said the museum’s director Eike Schmidt.