My oldest preserved map. Played on version 1.2.5.
Contains: one cobblestone unfinished building and artificial forest.

My first map with big plans (weren't finished) after big SMP experience. Played on version 1.6.1.
Contains: big underground cell with storehouse, plant and animal farms; cobblestone boundaries for future large town in the desert; new format mineshaft; first Nether base (very primitive).

My oldest long time played preserved map. Played on version 1.6.1.
Contains: one cobblestone fortress with storehouse, plant and animal farms, old format mineshaft (no visible mining system, 5-6 block per torch) and unfinished restoration project of my first multiplayer building.