My biggest three memories of FFXI are quite simple tbh..

1- The first time I went into Konschtat Highlands and spent hours trying to find Valkurm Dunes without a map.

2- The first time I got to Jeuno and got instantly lost.. Spent hours trying to learn the zone only to discover it spreads into three OTHER zones.

3- The first time I fought the Shadow Lord.. And everything preceeding.. Running through Beaucadine Glacier, Xarcabard and Castle Zvahl Baileys.

Beautiful game and every memory I have is fond and missed, and sadly, not quite re-touched by it's successor.

Those are just my 3 biggest and fondest.