ABOVE: A rainy day in Venice, Italy.
If you've every found yourself slipping and sliding on wet cobblestones, you'll appreciate one of Venice's least-heralded but most pedestrian-friendly urban features: the use of flat, lightly-textured paving stones that offer good traction underfoot on rainy days.
The same stone is used on many of Venice's 400+ bridges. As a bonus, the city marks the edges of stone steps and canalside pavements with highly-visible strips of white Istrian stone, making it less likely that you'll miss a step or stride inadvertently into a canal.
We don't know who came up with Venice's paving scheme, but urban designers and public-works managers from all over the world could learn a useful lesson by visiting Venice on a rainy day.