Here's how to match the keywords with the descriptions:
- Probably the most famous amphitheater in the world - The Colosseum
- Number of styles used in the construction of the Colosseum - Two
- This type of column was used in Roman forums and courtyards - Roman Doric Column
- The Romans neither understood or appreciated this column - Ionic Column
So the responses would be:
- The Colosseum
- Two
- Roman Doric Column
- Ionic Column