The Real Alcazar of Seville can be viewed for free on Mondays. Again, it’s best you pre-book your ticket for 1 Euro even for those free days so that you can skip the lines. If you are under 16 years of age, born in Seville or a citizen of Seville you can visit the Alcazar for free every day of the year. Note, only the general admission tickets are free and not guided tours.