Mountains, too. The land itself is not terribly desirable. Most of the value is created by the character of the people living there.
Dug into those mountains as well.
Yep.
Switzerland is a good model for an armed citizenry/militia, but HEAVY WEAPONS make the difference.
If a division of armor could operate in Switzerland, game over.
Might be a little more to it than that. The country of Georgia is pretty moutainous. So is Afghanistan. Both seem to get invaded pretty much like clockwork.
Switzerland was valuable real estate when people were invading Italy from the north. Nobody has really done that in a while (except Austria-Hungary during WW1 and they didn't need Swiss territory to do it).