That picture is definitely of the Initiation Well at Quinta de Regaleira, clearly got the same patterned floor as in the photo halfway down the page pvpeacock linked. Search might have lead you astray if you were looking for a site in Braga.
I believe you are correct . The internet seems to have had a brain fart! The photo I posted clearly says it’s a feature of the Church of Bom Jesus in Braga and describes the staircase! https://www.boundlessroads.com/landmarks-in-portugal/‘\
So you are up
Bingo! This was the site of a famous hotel back in the day that fell into disrepair and ultimately burned down. The Santa Catalina Island Company decided to upgrade the facility a number of years ago and it is quite nice now. Loon, you're up.
P.S. The view from Descanso looking toward Avalon and the Casino: https://girlwithbluesails.com/ezoim...g_5643.png?w=468&ssl=1&ezimgfmt=ng:webp/ngcb1