The Colosseum is an amphitheater in the center of the city of Rome, Italy. It is also known as the Flavian Amphitheatre. It is the largest amphitheater in the world and is considered to be one of the greatest Roman architecture and engineering works. It was used for a variety of events and could hold 50,000 people. Earthquakes and stone robbers left it in ruins, but part of it still stands today. The Colosseum opens at 8:30 am year-round and the line begins forming around 8 am. The Colosseum closes an hour before sunset making the times vary throughout the year. You can avoid waiting in line with a Roma Pass. If you chose to wait in line, tickets are €12 per person and those under 18 years of age are free. Tickets are valid for 2 days, though you can only enter once. The ticket is good for entry to the Colosseum, the Palatine Hill, and the Roman Forum. There is free admission for all on the first Sunday of every month.