Note: This post is a tip of the hat to Jane MacDuff!
Parc Zoologique de Paris (Vincennes): over 200 ft. high, this false stone mountain dominates the Zoo at Vincennes in eastern Paris. The zoo occupies the western part of the great Bois de Vincennes (Vincennes forest). Climbing the surface of “The Great Rock” is not allowed (except by mountain goats), but visitors are allowed inside the structure. An interior elevator whisks tourists up to several vantage points, from which there are spectacular views. Built between 1932 and 1934 by architect Charles Letrosne, the Great Rock Rock remains a curiosity of reinforced concrete construction. The entire structure is painted to look like natural stone. After this summer the Vincennes Zoo will close for a major restoration.
Métro: Porte Dorée (line 8)