Lisbon has unique sidewalks, which are beautiful—and dangerous:
In a city without an iconic monument like Paris’s Eiffel Tower or Rome’s Colosseum, Portuguese pavement has become become Lisbon’s calling card. Its graphic black-and-white patterns are printed on souvenir mugs, canvas bags and T-shirts. City Council has even gone so far as to propose the sidewalks be added to UNESCO’s Intangible Cultural Heritage list, alongside Portugal’s melancholic national music, fado.
Portuguese pavement is excellent for subterranean aquifers because they allow rainwater to seep through the junctures between the stones, helping prevent flooding. But their maintenance is nothing short of Sisyphean. No sooner have crews of specialized workers, known as calceteiros, finished the arduous task of breaking limestone into bits of the proper shape, laying them out like puzzle pieces and hammering them into place with what looks like an oversized wooden pestle, do the stones start popping out. A single missing stone can trigger a snowball effect, causing others to fall out and leaving lurking holes.
Rainfall makes the situation even dicier. A 2011 survey of elderly Lisbon residents put the sidewalks at the top of their list of things they most fear. They’re also a daily crucible for disabled people, and those with strollers or suitcases.
Yeah, but they're gorgeous. I might have accidentally stolen one, too.