Everyone thinks they know Venice: gondolas, canals, pigeons in St. Mark’s Square, a few too many selfie sticks.
But spend any time looking past the postcard version of the city, and it turns out Venice is stranger, more fragile, and more engineered than most visitors ever realize.
Here are 10 facts about the city that go well beyond the guidebook version.
1. The Canals Are Way Shallower Than You Think
Most people picture Venice’s waterways as bottomless. In reality, the small interior canals average just 1.5 to 2 meters (5 to 6.5 feet) deep.
The Grand Canal runs somewhat deeper, around 5 meters, and the industrial channels built for large ships outside the historic center reach 12 to 15 meters.
That shallowness has real consequences: during especially low tides (bassa marea), some smaller canals can partially empty out, turning into muddy channels that strand boats until the water returns.
2. Venice Is Sinking – But Not for the Reason You Think
St. Mark’s Square is the lowest point in the city, which is why it’s always the first place to flood during acqua alta, Venice’s periodic high-water events.
Contrary to popular belief, the city isn’t disappearing primarily because of its own weight – natural subsidence only accounts for around 2 millimeters a year. The bigger driver is rising global sea levels.
Venice actually has an advantage over cities facing a similar fight, like Miami: a $7 billion system of movable underwater barriers called MOSE, made up of 78 panels that can rise from the seabed to seal off the lagoon during dangerously high tides.
Since becoming operational in 2020, the system has been activated dozens of times a year and prevented hundreds of millions of euros in damage.
Miami, by contrast, sits on porous limestone bedrock that lets seawater seep up directly through the ground – a problem no barrier can solve.
Some projections suggest Venice could become uninhabitable by 2100 if sea levels keep rising at current rates, but MOSE has bought the city real time, even as scientists warn that closures are becoming more frequent as the sea continues to rise.
3. Watch Your Step: Hundreds of Tourists Fall Into the Canals Every Year
Steps that lead directly down into the water are often coated in slick green algae, and local rescue services report that hundreds of tourists slip and fall into the canals annually – most often while taking selfies, staring at their phones, or simply standing too close to the edge. Beyond the shock of the cold water, currents can be surprisingly strong, and many of these steps have no railing at all. City officials regularly warn visitors not to sit on them.
4. A City of a Few Square Kilometers, Visited by 25-30 Million People a Year
Venice’s historic center draws somewhere between 25 and 30 million visitors annually, packed into a footprint that covers just a few square kilometers.
The strain became impossible to ignore with cruise ships: vessels over 25,000 tons have been officially banned from sailing near St. Mark’s Square and the Giudecca Canal, after it became clear their massive engines were disturbing the lagoon’s fragile seabed and undermining the foundations of centuries-old buildings. Large ships now dock instead at the nearby industrial port of Marghera.
5. The Vanishing Venetians
In the 1950s, roughly 175,000 people lived in Venice’s historic center. Today, that number has fallen below 50,000, and the city continues to lose population – roughly 800 to 1,000 residents a year in recent years.
Locals point to a familiar mix of causes: the city is increasingly organized around tourism rather than daily life, property prices have become prohibitive, even mundane errands are a logistical challenge without cars, and younger residents are steadily relocating to the mainland town of Mestre.
Some Venetians have described watching their home slowly turn into a full-time theme park.
6. Beyond St. Mark’s: The Bridge With a Much Darker Backstory
Everyone knows St. Mark’s Square, with its basilica and the Doge’s Palace. But wander a little further and you’ll find the Bridge of Sighs (Ponte dei Sospiri) – widely assumed by tourists to be a romantic landmark.
Its real story is considerably darker: the name comes from the sighs of prisoners who caught their final glimpse of sunlight and the beauty of Venice through its windows, moments before being led into the dungeons on the other side.
7. Where to Actually Escape the Crowds
Skip the packed alleys around the Rialto Bridge and head instead to Cannaregio or the island of Giudecca.
In northern Cannaregio, the canals are quiet, laundry still hangs between windows, and small local wine bars (bacari) line the streets – the kind of place where you can wander in the evening and feel like you have the entire city to yourself.
8. The Secret World of Gondoliers
Gondoliering is a closed profession, passed down for generations from father to son – and, more recently, to daughters as well.
The number of licenses is capped at roughly 400. Getting one requires far more than owning a boat: aspiring gondoliers must pass rigorous exams covering the city’s history, foreign languages, and a hands-on navigation test that’s reportedly much tougher than a standard driving exam.
The gondolas themselves are handcrafted from eight different types of wood and can cost upward of €40,000 – roughly the price of a luxury car.
9. Is the Water in the Canals Actually Clean?
Not really. Venice has no modern underground sewage system. Wastewater from most homes runs through septic tanks – some of them centuries old – before draining into the canals.
What keeps the city from becoming a stagnant mess is the Adriatic Sea itself: the tides flush and replace the canal water roughly every 12 hours.
During the 2020 pandemic lockdowns, when boat traffic came to a near-standstill, the water famously turned clear enough to see fish swimming – not because the water was suddenly cleaner, but because the sediment on the canal floor simply stopped being churned up.
10. The City Built on a Forest, in the Middle of the Sea
Perhaps the single most astonishing fact about Venice: the entire city rests on millions of wooden piles driven deep into the muddy floor of the lagoon, mostly larch and oak.
So how has that wood survived for over a thousand years without rotting? Because the piles are fully submerged in water and buried in mud, they’re cut off from oxygen – and without oxygen, there’s no decay and no bacteria to break the wood down.
Over centuries, minerals in the water have gradually petrified the timber, turning it into a foundation nearly as hard as stone.
To put the scale in perspective: the basilica of Santa Maria della Salute alone sits on more than one million wooden piles.
Sources:
- We Build Value, “Mose: The Infrastructure Protecting the Venetian Lagoon,” webuildvalue.com
- Nature, “Venice’s flood barriers are working overtime. How will they change the lagoon?” nature.com
- BIG SEE, “MOSE flood barriers,” bigsee.eu
- NBC News, “Venice fears exodus of residents after latest flood,” nbcnews.com
- Sea-Help, “Mose Venice: protective barrier or waste of money?” sea-help.eu
- Atmos, “What We Can Learn From a History of Venice Floods,” atmos.earth
