[Can anyone remind me what this place is?]

You are the best thank you so much! I was beginning to think it was a fever dream!! 

[Can anyone remind me what this place is?]

When I played this game as a teen in the early 2000's I remember there being a place that was only open for 2 hours a night. For me, it was from 6 pm - 8 pm and it was like a training field where you went and killed mobs for a while and got extra exp. I also remember it spawning special jelly bean mobs that gave huge exp drops. Other than that all I can remember was that it was for lower-level characters and I think you entered it from Junon polis. I know this is super vague and I wish I could provide more info, but anyway does anyone remember this and is it still a thing?

[Why are high level players in low level zones?]

Ty everyone for your answers this makes a lot more sense now! 

[Why are high level players in low level zones?]

I've noticed several people from the guild Reapers in low-level areas killing a bunch of mobs not really looting stuff. I'm just curious about what they are doing. Is there a reason for grinding those low-level mobs? I played when I was young and recently refound the game so I could be missing something.