OK - So I started looking around Work on OSM and discovered that some of the buildings are mapped, as well as the main rings (SPS and LHC). Sadly the level of detail is 'intermittent'.

2 choices
* Walk round site with camera / GPS and get all the building details
* email the people in Patrimony and Site Information to see if we can get an extract of the data.

What I'd really like to do is explore relations here (pseudocode follows)
Generate a 'primary relation' called CERN and add all the sites to it -- Meyrin (main), Prevessin, the access points and the rings.

Then within say the CERN->Meyrin site I'd have all the entrances, buildings, roads etc.

Does this sound like the right way to do it?

I'm reluctant to start messing too much as there's already relation #27705 covering some of the site.