Went back to beautiful Barcelona for my 3rd time this past November and made some new finds.
When Indy sees the ballet poster, he's standing on the east side of the Barcelona Cathedral on Carrer del Comtes, facing the tiny Plaça de Sant Lu.
The theatre entrance looks different because that building had a huge fire in January 1994 (just 2.5 years after they filmed there) and had to be rebuilt. The Gran Teatre del Liceu opened again in 1999. Its location is right on La Rambla between Carrer de Sant Pau & Carrer de la Unió.
More to come!