theromanguy.com

W7OLL TIL The Roman Colosseum is as big as our stadiums today, estimated to fit 50,000 and 60,000 people by archeologists. According to official records of Roman Regional Catalogues from the 4th century, it holds 85,000 people
NXr88 TIL beginning in 46 B.C., in celebration of Julius Caesar's return to Rome after defeating Pompey the Great, the Colosseum was ordered to be flooded for a ship battle reenactment in honor of his military efforts against Gaul & Egypt.
OGnQX TIL the Swiss Guard who guards the Pope must take a vow of celibacy, pass Swiss Army basic training and several other things. They had had a heroic last stand where they were massacred defending Rome in 1527 and there are only 135 of them at one time.