- Traders and Builders [1]
- Inns and Cathedrals [2]
The base itself is little limited - but with these two expansions you have one of the best sets for a nice evening with friends. You can also add River or River II expansion - but they only 'divert' the beginning of the game - so you can omit them.
The Carcassonne is really a simple game - yet it takes real thinking and strategy to really master it.
What I like the most about Carcassonne is its 'minimalistic' approach. There are roads/cities/grasslands/monasteries ... and nothing else ... yet taking someone else' city or road is very important strategic move - or splitting the work between X players.
You do not need cards, figures, notes, calculators, excel or dice. You just play and move the cones on the scoring board.
Regards.
[1] https://carcassonne.fandom.com/wiki/Traders_%26_Builders