One of the things one notices almost everywhere in Lisbon, are the tiles, called Azulejos.
Indoors, outside, there is even a National Tile Museum. Located in the former Convent of Madres Deus, has tiles dating back to the fifteenth century. The intact chapel is spectacular. The museum is also fully accessible.
These pictures were randomly taken during my many walks around Lisbon while on vacation. The only downside to the exterior tile work is the graffiti which is all over Lisbon, and doesn’t get removed.