Chrono Cross is the pinnacle of the genre for me.
I played it 4 times with a few month intervals on PS3 and PSP in 2012-2013. It has the most amazing visuals, locations and some of the music tracks are amazing. After that I haven't been able to play any other, they all seem bland in comparison. On positive side I save a lot of time for other genres and fapping. I think CC is one of the underappreciated games ever. It easily made my top 10 and that is extremely hard to do.
Deus Ex (2000) - a game that pushes the boundaries of what the video game medium is capable of to a degree unmatched to this very day.