La Grave means serious or severe. Or the name could also be derived from the old French word "grave", which refers to gravelly soil. Let's not think about the English meaning, at least before the visit:) 

There are more huts to tour around in the region both for weekend trips or more serious climbs. 

Maps

Topo maps IGN géoportail (Carte topographique IGN must be turned on in layers)

Google Maps for bus schedules. 

Map of Area