I'll bite:

La Casa Que Canta, Zihuatenejo, Mexico
Le Bristol, Paris
Twin Farms, Vermont
Claridges, London
Soniat House, New Orleans
St. Regis, NYC, Fifth Avenue
The Beverly Hills Hotel
Sherman House, San Francisco (now defunct, my heart still breaks)
The Savoy, London, yes, I know many pooh-pooh this venue but a Thames view room or suite truly is exceedingly special, halcyon for us.