Venice Acqua Alta: What It's Actually Like to Walk on Water

Acqua Alta occurs when astronomical tides, low atmospheric pressure, and south winds combine to push water from the Adriatic Sea into the Venetian Lagoon. St. Mark's Square is the lowest part of the city and floods first. The city sets up elevated wooden walkways so you can still walk around, and sirens warn residents hours in advance. If you visit in autumn, don't panic—just buy a pair of cheap rubber boots from a local shop and enjoy the unique reflection of the palaces in the water.