tribunesandtriumphs.org

nRy9 TIL during the inauguration of the Roman colosseum 9000 animals were killed in 100 days. Some species of animals were killed in such large numbers that they went extinct.
Vbw4 TIL that Ancient Romans had to get tickets to go to the colosseum. The tickets had the section, row, and seat number written on it for assigned seating, just like stadiums do today.
A5xw TIL It took 4 million gallons of water 7 hours to flood the Roman Colosseum 5 feet for their famous naval battle reenactments.