There are under-surface nooks and overpasses, also destructible (in fact, most of the nooks are accessed in just that way). Notably, the terrain is optionally

There are under-surface nooks and overpasses, also destructible (in fact, most of the nooks are accessed in just that way). Notably, the terrain is optionally permanently destructible, but you could switch it to temporary if the machine didn't have too much ram (by the standards of '98). In practice, having a sizeable fraction of the world(s) destroyed, as a side effect of normal business, did hamper the vibe, so having the damage be temporary was just saner.