The Pantheon is the only completely intact piece of roman architecture left in the world. It is magnificent and no trip to rome is complete without a visit inside where, among other things you can find the remains of Donatello the famous renaissance sculptor and Raphael the painter... the pantheon is held up by monolithic marble pillars each weighing 90 tonnes which were brought to Rome by ship from Egypt over 2000 years ago. Inside the pantheon you should look up and admire the "oculus" i.e. a hole in the roof 9 metres wide and a symbolic link between the roman worshippers and their gods. Curiously the pantheon's height is exactly the same as the radius of its' dome... consequently inside it could host a perfect circle or better still would be the perfect place for a fisheye photo... if only they'd let us inside!!!