Visiting the CERN was, for me, like walking into a...

Visiting the CERN was, for me, like walking into a huge Catherdral like the Duomo di Milano, in that it is awesome yet mystifying.
So much technology and soo many scientists that you can't really begin to comprehend what happens there. However on one of their open days you can start to get an insight into the individual research centres scattered across the campus...