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On the sign:
VESTIGES DES FONDATIONS DE LA BASTILLE 1 TOUR DE LA LIBERTE! DECOUVERTS EN 1899 ET TRANSPORTES SUR CET EMPLACEM
The remains of the Tour de la Liberté, one of the eight towers of the Bastille which, before becoming a state prison, under Richelieu, marked the Porte Saint-Antoine in the enclosure of Charles V. These vestiges, brought to light around 1899, during the construction of the first metro line linking Vincennes to the Place de l’Étoile, were moved and rebuilt stone by stone.
(The text from the sign indicated the garden where the remains are (Henri-Galli) Click for sign's details