I went with low expectations and was delighted to be surprised. The Colosseum was bigger than I thought, and like most Roman ruins outside Italy, except for the Temple and Arena of Nim, the Colosseum of Arles and the aqueduct near Nim. Easy to find using the metro (the station is clearly marked) and a short distance from the metro. The venue itself is a well-used park. Great for relaxing and enjoying the tranquility of Paris. Will you stay there for a long time? It's the same as visiting any Paris park. It's free, no queues and crowds.