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Sign up and I'll remember your taste, your people & your saves.
© 2026 Go Playfully Inc
Themed TourDescend a medieval limestone staircase into one of Pontoise's largest underground quarries, where 12th-century gothic vaults have starred in films like The Ninth Gate. Free guided tours run every half hour through this surprisingly cool hidden city beneath the city.
Themed TourDescend a medieval limestone staircase into one of Pontoise's largest underground quarries, where 12th-century gothic vaults have starred in films like The Ninth Gate. Free guided tours run every half hour through this surprisingly cool hidden city beneath the city.