Peña palace was intriguing and beautiful! Not being a fan of crowds, and waking up very early due to jet lag, we bought Skip the Line tickets and arrived before opening. The only headache is that the Headout App would not display our tickets for what felt like ages. This was very exasperating as we had been like 3rd in line before opening and then ended up having to wait just to get the Headout tickets to load. We used the palace WiFi, but it didn't work for a long time. Note to print out or take screen shots of tickets in the future! Nevertheless we still got in early and were able to enjoy the interiors with very light crowds, thanks to it being October and it being early AM. Definitely impressive with wonderful views! Walking down through the park to historic Sintra was also beautiful --and much nicer to go down than to climb up!