Located underground, bellow of Jardim do Príncipe Real, about 270 m walking distance from the Reception desk at Museu Nacional de História Natural e da Ciência.
The street level entrance to the Patriarcal Reservoir, at the center of Jardim do Príncipe Real
Those physically fit may experience walking the underground gallery, from the left side of the Reception desk to the Patriarcal reservoir, bellow the Rua da Escola Politécnica.
The street level entrance to the underground gallery at 60, Rua Escola Politécnica.
Those who enter from street level at Patriarcal Reservoir have the option of walking, about 400 m, through the underground gallery down to Miradouro de São Pedro de Alcântara.
Please notice that the tunnel is narrow, with a noticeable humidity level and some stairs going in and out.