This past easter I went to La Garrotxa, a volcanic area in the centre of Catalonia. It also happens to be the political centre of the formation of Catalonia as a political entity starting with the Iberia Mark stablished by Carlemagne. As such, it sseems perfect to stablish a saga. Eventually. The presence of at least 2 perfectly kept medieval city/villages there (BesalÃº and Santa Pau) makes it much more interesting to set the mood as well, but that is secondary.
The important thing is that La Garrotxa is a volcanic area. I took a balloon tour and couldn't keep myself from spotting at least 3 high magic auras while perched up high in the sky in that magical Auram creation. One of the most obvious ones has been covered by a Divine aura, but MUST be a magical aura if you remove that pesky church. I have no doubts it was put there to hinder the previous magical aura by an overjealous servant of the Divine. Filthy little bastards....
The said location is no other than the crater of the Santa Margarida volcano.
As you can see, the crater is quite circular (possibility for HUGE ring/circle spells?) and the brim of the volcano can easily nerf out unwanted sounds, like those of church bells (thus, keeping a magical aura in the inside part of the volcano crater).
The aura contains a number of volcanoes (40 in the whole county), and in the middle ages would have been quite rugged.
In fact, right now it is a protected natural environment and it contains some quite forested areas.
Some more inspiring photos in this link:
BesalÃº, inclusding a nice jewish quarter and a medieval fortified bridge as well as a 12th century hospital run by the order of the hospitalliers
Santa Pau: 1 km from the volcano herself and AMAZING for inspiration once you are walking through its streets. I think I spent something like half a Gb of memo of my mother's digicam there....
Got carried away writing that. The magical questions coming later.
EDIT: Just saw the photos in my mother's camera. I think I will substitute quite a few of the above with those since they are my own copyright AND better than the ones shown above in some cases.