This Is another leading tourist attraction in Madrid. Touring the palace to view its ornately decorated rooms draws huge quantities of holiday makers everyday. You may be purchasing a timed entry ticket. If tickets are sold out, they can even be bought on GetYourGuide. For those who have any questions https://www.kinship.co.uk/dog-lifestyle/what-to-do-with-your-dog-when-you-go-away-on-holiday