SteveC
Doing the best imitation of myself
First, I will give a big thumbs up to War of the Burning Sky. I ran it back during the 4E days, but I really like the underlying plot and premise of the adventure. My players had a great time and the game only stopped due to the group breaking due to moves from players.
Outside of that, it looks like the 5E version of Abomination Vaults is finally coming out. I am running this right now for Pathfinder and it is a blast. It is a mega dungeon, but also small enough and with enough interaction with the town above to be interesting. I haven't seen the 5E translation, but I don't see any reason it wouldn't work for 5E.
Those are two suggestions that are very different but I think both will be excellent.
Outside of that, it looks like the 5E version of Abomination Vaults is finally coming out. I am running this right now for Pathfinder and it is a blast. It is a mega dungeon, but also small enough and with enough interaction with the town above to be interesting. I haven't seen the 5E translation, but I don't see any reason it wouldn't work for 5E.
Those are two suggestions that are very different but I think both will be excellent.