maps >
relaischateaux.com
mrandmrssmith.com
kiwicollection.com/search
lhw.com/find-a-hotel
designhotels.com/hotels
https://en.wikipedia.org/wiki/Design_Hotels
no maps >
secret-retreats.com
those are examples of marketing companies, there are also agency programs
i am skeptical re virtuoso etc , for example hotel well received by agents but only after joining