1. Catacombs of Saint Callixtus. Located along the historic Appian Way, the catacombs of Saint Callixtus are the largest and most well-known of the Roman catacombs.
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The catacombs in Paris really don't have the same historical significance as do the Roman ones. In Paris, the bones were moved down to the catacombs from overflowing cemeteries following war/disease periods. The catacombs in Rome have a background related to religious persecution of Christians.
However, the strong smell of the Paris catacombs is apparently what all the initial signs were warning sensitive visitors about. At best, it could be likened to the dusty, incense-infused scent of old stone churches, but with an underlying malaise that can only be attributed to the contents of multiple cemeteries.