The Colosseum is one of the biggest attractions in the world and has been around since 80 AD when it was completed. The Colosseum started to be built in 70 AD and was completed in 80 AD. The Colosseum was built entirely out of stone and weighed a whole 400 000 tons. it had 4 floors and could hold 45 000 to 55 000 people. The arena was used for battles/fights and big announcements. Currently it is a sight seeing attraction and there isn't any live activities there.
This is the Colosseum after multiple earthquakes had wrecked it. This picture is one of the most famous pics of the Roman Colosseum.