A lot of LN awesome stuff here, including lots of merchant lists
https://darthcoin.substack.com/p/lightning-network-is-awesome

BTCMap will show a Lightning symbol (⚡) if the location has support for LN, but just spot checking, I haven't seen any actual locations with that data. So it will take some participation from the crowd to get that updated for existing locations, and add new locations as well.

https://btcmap.org/map

https://btcmap.org/