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The Pantheon is an ancient Roman temple built in service of the Roman deities. It is one of the five landmarks in Rome that Luigi visits in the DOS and Deluxe versions of Mario is Missing!, and one of two that is exclusive to those versions (alongside the Spanish Steps). A group of Koopa Troopas invade the city and steal one of the Columns, which Luigi gets back and brings to the Pantheon's information booth. The booth's clerk then asks some questions to prove the authenticity of the Column, listed below. After Luigi correctly answers them, the Pantheon is reopened for visitors once the Column is returned. Incidentally, the Pantheon has 16 columns in reality, with eight at the front and the remaining eight behind them in groups of two.
The Pantheon is the best-preserved building in the world. It dates from the early days of ancient Rome and is still almost completely undamaged. The beautiful public building was built from brick and marble in 27 BC. Its design was considered a great feat of engineering because it allowed for comfortable lighting and cool temperatures. These details have fascinated modern scientists for hundreds of years.