Fünf Wochen im Ballon (1962)

Famous explorer Doctor Samuel Fergusson and his nephew Oliver team up with Irumu, the Emissary of King Umtali, on a perilous journey to collect a gift from the Bantus of South Africa for Queen Victoria - a priceless diamond known as 'The Eye of the Cat'. They set out on their quest in a hot air balloon that will take them over Africa to Devil's Peak in Bantu, unaware that the Duke of Salisbury is also trying to reach the location of the diamond so he can take it for himself.