Verdant Jungle - Osprey

Verdant Jungle - Toucan Valley

Toucan Valley makes it onto my list of "Most Unusual Maps" because of it's three entrances. It's one of only two maps that has three entrances (Rio Blanco in the Desolation region is the other).

Rambling Badlands - Iguana Flats

Note: You are unable to build any tunnels on this map.

Desolation - Amchitka Mesa

Desolation - Fallout Epicenter