Was looking back over this thread and am surprised there are no new additions. St Regis Hong Kong and St Regis Venice are both exciting possibilities that we plan to visit.

Greece and Spain both turned out to be near perfect trips. All of the hotels we stayed at (including our Paris stop at Prince de Galles) were highlights. We honestly didn't have a mediocre stay (except our last stop at Park Tower Knightsbridge- we won't return there) Greece was Grande Bretagne, Mystique and Domes of Elounda (Haute Living). Spain
was Hotel Arts, Maria Cristina, Madrid Palace and Alfonso XIII. We would return to all of those and are actually planning a return visit to San Sebastian with a return to Maria Cristina and a stay at Marqués de Riscal since we missed it during their renovation.

Later this year we will try Tambo del Inka and Palacio del Inka and we have heard good things about both.

Would love to see this list updated for inspiration!