The Parque Guell, 17ha or 42 acres, was originally meant as a city. As every city, it has a main square, with a fantastic view over the city and the Med.
And there is a public bench. Just one. Well, it is the longest in the world, 826 meters, half a mile. The bench is in the shape of a sea snake, and decorated with broken tiles, in a technique known as trencadis. Here is a view of a part of it.
And some more detailled views of the tiles.