Tourists take pictures in the flooded St. Mark's Square as the city of Venice has seen its worst flooding in more than 50 years and the clean-up has just begun in Venice, Italy, November 14, 2019. /VCG Photo

Floodwater levels in the city are the second-highest since the city started keeping a record in 1923 as a result of the acqua alta, high tide peaks that periodically occur in the northern Adriatic Sea. The floodwaters hit 1.87 meters late on Tuesday night. /VCG Photo

Venice Mayor Luigi Brugnaro has declared a state of emergency, saying that climate change is menacing the historic maritime city. /VCG Photo

Some businesses have been affected. Chairs and tables were seen floating outside cafes and restaurants. The city has been left with millions of U.S. dollars worth of damage. /VCG Photo