As a team, solve the intrigue of the Cathedral by unraveling all its mysteries! Journalists from the famous Monu'Mental Magazine, you are sent to the city to find out what has just happened at Strasbourg Cathedral... Start your quest in the square bearing the name of the Grande Dame and wander throughout your adventure in the most beautiful adjacent streets and alleys, in the heart of the Carré d'Or of the Alsatian capital. Equipped with a smartphone per team, carefully observe the surrounding buildings and uncover their secrets by finding discreet details inviting you to solve puzzles and enigmas to progress in your journalistic investigation. Between suspense, fiction and heritage, this activity will allow you, without even visiting it, to know everything about this building and above all: you will discover that you were far from imagining all the mysteries and secrets that lurk around the one that only has 'an arrow... Please note: entry/access to the building not included. It is not required to enter the monument as part of the game. Only the plot integrates its history and legends into the scenario you will play.