You can visit inside the Colosseum out of regular hour. you can get access to the reconstructed floor of the arena, little of which remains of the original surface, and look down between gaps to see the underground chambers. Next, head below ground to explore the chambers themselves, where wild animals were held and gladiators prepared for their fights. This section of the Colosseum is only open to a select number of visitors each day, so enjoy this rare opportunity to see more than most visitors do during the day, let alone at night. After exiting the Colosseum, your tour ends outside.