I had the good fortunate to spend an entire day at the old World of McIntosh Townhouse that used to be in SoHo, NYC. The Townhouse was closed, it was the day after an album release event, but the Director gave me total control of all 5 floors and every room, which all had specially designed systems utilizing the McIntosh family at that time (February 2020 -- McIntosh, Audio Research, Sonus Faber, Pro-Ject, Sumiko).
The Main Room (a 2 story living room/reception area) had their famous $1 Million System -- Four XRT2.1K Floor Standing Loudspeakers, 3 amps driving each speaker, multiple Subs, surround speakers, highest end preamps, processors, turntables, CD Players, Streamers...just an insane setup. The gear took up an entire room behind the 2 story bookshelf that you sat in front of to listen.
It was just surreal. An original Banksy was on one wall, and a Klimt was on the other wall. I've never heard sound systems like I heard that day. Every room was mind blowing, but the showcase system was a bucket list item for me. I still contact Franz (the Director) to this day thanking him over and over.