The Gate of the Ancients - S4.E5

Guided by the map stolen from Gomez, our heroes are flying over the city of Zimbabwe when, believing they have been beaten by Ambrosius, Esteban crashes. The children are taken to the palace gardens of the king Neshangwe. Seeing Zia's medallion, the king shows them "The Gate of the Ancients", a very old orichalcum arch. Thanks to their medallions, our young heroes pass through the mysterious arch which teleports them to Francis I, the king of France, in his castle at Chambord...