Rather new to HRC 'spotting', but here is my list so far:

The Americas:
Detroit
St. Louis
Sacramento
Cleveland
Chicago

Asia:
Hong Kong (Not the actual café as it is closed for re-construction, but the souvenir boutique on the Peak)

Europe:
None so far despite living only 10 minutes from the one in Copenhagen and have been traveling throughout Europe extensively. If anyone is planning to visit the one in CPH and needs a local eating buddy let me know