Tourists walk through a flooded Piazza San Marco in Venice, Italy, on October 29, 2018. #

Tourists take a gondola in spite of the acqua alta in Venice on October 29, 2018. #

People walk in a flooded Piazza San Marco during a period of seasonal high water in Venice on October 29, 2018. #

A restaurant owner looks at the floodwaters on October 29, 2018, in Venice. #

People walk on a temporary catwalk past a flooded Piazza San Marco on October 29, 2018. #

A tourist walks past Piazza San Marco on October 29, 2018, in Venice. #

Tourists carry a stroller through the floodwaters near the Rialto Bridge on October 29, 2018. #

A typical Venetian boat sails through a flooded Campo San Giacometto in Venice on October 29, 2018. #

A couple walk through the flooded Piazza San Marco on October 29, 2018. #

A man carries a table in the flooded Riva degli Schiavoni during a high-water alert in Venice on October 29, 2018. #

Tourists walk in a flooded street near the Rialto Bridge on October 29, 2018. #

Tourists walk across an emergency walkway in Piazza San Marco on October 29, 2018. #

A man walks in the flooded Piazza San Marco on October 29, 2018. #

Tourists carry their luggage above the water in a side street in Venice on October 29, 2018. #

A view of the flooded Piazza San Marco on October 29, 2018. #

A man empties a bucket of water on a flooded street during a high-water event in Venice on October 29, 2018. #

Tourists wade under arches next to the flooded Piazza San Marco on October 29, 2018. #

People walk past gondolas during acqua alta in Venice on October 29, 2018. #

A man sits on a chair in Piazza San Marco during a high-water event in Venice on October 29, 2018. #

Piazza San Marco, or St. Mark's Square, flooded during an acqua alta alert in Venice on October 29, 2018. #