“The Colosseum is probably the most famous landmark in Rome. Built in the 1st century AD, this great arena could seat 45,000 spectators and was the largest Roman amphitheater in the world.
It hosted gladiatorial combats, spectacles with wild beasts and possibly the execution of early Christians. Throughout the Middle Ages, the Colosseum was believed to be a place of martyrdom and was therefore regarded as a sacred place."
Excerpt taken from this Sacred Destinations article