#1
Catacombe di San Callisto
Catacombe di San Callisto is a historic underground burial complex on the Appian Way, with ancient tunnels, crypts and a museum component. Guided visits explain the site’s construction and early Christian history, while the underground route offers a cooler, atmospheric break from Rome’s heat.
Tickets are arranged online and visits run in morning and afternoon sessions, so checking the time slot before travelling is important.