Lisbon is called as "Seven-Hills-Town"
Several shopping streets run from north to south, along the valley between those hills. they're the only streets we can walk easily.
And almost all the streets in Lisbon are paved with pretty stones.
so even on a hillside, where paths are mostly steep slopes,
those stones help us to walk up and down.
Sometimes you find dogs' droppings in a narrow spaces between stones.
it must be hard to dig them out to clean up the streets.