Twilight Imperium, I play it every couple of months because it's very big, and polarity which I play more than once per week.
i don't know many board games, but am totally happy if someone can be seduced to a round of scrabble.
I play scrabble (mainly Words w/ Friends now), and Pursue the Pennant.
Pursue the Pennant is a baseball board game that I played with friends when I grew up in NY. Every visit up to NY, me and my friend set aside an entire day to nerd out.
Monopoly is still good but I haven't played it in over 5 years. I'm not much for board games, cards, games in general or on an app or a computer. I'm usually doing something else.
Every now and then I find somebody smiling and jabbing their thumbs at their phone in an excited way and I ask them what they are doing. "I'm playing a game" they say. Imagine that in a sci fi movie.
It's been ages since I played. Monopoly, Las Vegas were two favorites.
I play scrabble a few times a month and have recently added monopoly to the arsenal