The Pantheon in Paris is up there with the most interesting buildings I have visited. I was about to call it a church, but that would be incorrect, as some time ago it was changed to a secular mausoleum. The interior is amazing, so much colour and detail. The main feature for me though is the 67 metre pendulum which hangs from top of the central dome. This pendulum demonstrates the Earths rotation, as it swings along its plane our planet rotates underneath it. It completes a full rotation in around 32 hours. The Pantheon is also home to an elaborate crypt and is resting place for such recognisable people as Victor Hugo and Jean Moulin.