Yesterday we visited the Museu Nacional do Azulejo (National Tile Museum).  Azulejo comes from the Arab word azzelij or al zuleycha, which means "small polished stone" and Portugal is known for its decorative tiles.  This is especially true in Lisbon where so many of the buildings are covered in colorful tiles.  The museum is housed in a 16th-century convent and the collection has tiles dating back to the Ottoman Empire.