A man poses in a flooded St. Mark's Square during a period of seasonal high water in Venice, February 6, 2015. REUTERS/Manuel Silvestri (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

People walk on the flooded St. Mark's Square during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY) 

Street vendors sell fish during a period of seasonal high water in Venice, February 6, 2015. REUTERS/Manuel Silvestri (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

People walk through flood water along a pathway next to St. Mark's Square during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY ) 

Men carry children and a stroller through a flooded St. Mark's Square during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

A man stands inside a bar during a period of seasonal high water in Venice, February 6, 2015. REUTERS/Manuel Silvestri (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

A woman walks through the flooded St. Mark's Square during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

A tourist pulls their luggage during a period of seasonal high water in Venice, February 6, 2015. REUTERS/Manuel Silvestri (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

People walk during a period of seasonal high water in Venice, February 6, 2015. REUTERS/Manuel Silvestri (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

Tourists walk on raised platforms above flood waters in St. Mark's square during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

A man sells Wellington boots in flood waters near Rialto Bridge (background) during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY ) 

Masked revellers walk on raised platforms above flood waters during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

A man carries materials as he walks across the flooded St. Mark's Square during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

A man pulls a cart carrying fruits and vegetables through a flooded St. Mark's Square during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT AGRICULTURE) 

A man pulls a cart carrying fruits and vegetables through a flooded St. Mark's Square during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT AGRICULTURE) 

Masked revellers pose along the flooded St. Mark's Square during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

Tourists walk on raised platforms above flood waters in St. Mark's square during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

People take a "selfie" picture at the flooded St. Mark's Square during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL ENVIRONMENT SOCIETY) 

Tourists walk on raised platforms above flood waters during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT) 

Doge's Palace (L), next to St. Mark's Square, is seen flooded during a period of seasonal high water in Venice February 2, 2015. REUTERS/Manuel Silvestri ( ITALY - Tags: TRAVEL SOCIETY ENVIRONMENT)