Yesterday I was planning to spend next day walking around Zurich. But in the morning, while having breakfast I decided randomly visit CERN website and check if they have any tours available. They did. I had an idea to visit CERN quite a while ago, but they always seemed to be fully booked. First of all, you can visit CERN exhibitions without tour/booking, but if you want to get a glimpse at first particle accelerator built at CERN or how LHC (Large Hadron Collider) is run, then you need to book a tour visit.