Railway of the Prince Imperial
The railway of the Prince Imperial (French: Chemin de fer du Prince impérial) was the first documented model railway in the world. == Location == The model railway was built in 1859 for Napoléon, Prince Imperial, the 3-year-old son of emperor Napoleon III, in the private park of the Château de Saint-Cloud, between the Bassin des Trois Bouillons and the Bassin des Chiens.
Source: Wikipedia — Railway of the Prince Imperial (CC BY-SA 4.0)