There's Petty's Orchard in Melbourne (Templestowe): https://www.manningham.vic.gov.au/venues/pettys-orchard who maintain about 200 varieties of apple.

I have no idea what it's like now, but I went to an open day there years ago and it was incredible. What I learned is there are some extremely ugly Apple varieties that would never get picked up by supermarkets, but tasted unlike anything else I've sampled - literally like candy. Looks like Heritage Fruits still do antique apple tastings periodically: https://www.heritagefruitssociety.org/Antique-Apple-Tastings...