The Colosseum
81
Held 50,000 spectators. Could be flooded for mock naval battles; had a retractable awning (the velarium) operated by 1,000 sailors. The template for every stadium since.
81
Held 50,000 spectators. Could be flooded for mock naval battles; had a retractable awning (the velarium) operated by 1,000 sailors. The template for every stadium since.