The following is a free translation of a recent post by the Museum responsible for the management of the Aqueduto (Aqueducts) Das Aguas Livres, in Lisbon, Portugal.
Original post in Portuguese here: http://bit.ly/1e7Vidz
"The crossing of the Vale de Alcântara reopened to the public last Saturday 1 March, 2014 and will be open from Tuesday to Saturday, from 10:00 to 17.30. Visitors are free to wander during this period.
€ 2 - adult
€ 1 - seniors and students
Free - Children up to 12 years
Address: Calçada da Quintinha, 6 (in Campolide),Lisbon"
A location map can be found here: http://goo.gl/maps/xB8AE
Information on the two local bus routes can be found here
Carris Bus 712 from Sta. Apolonia and Marques de Pombal - http://www.carris.pt/pt/autocarro/712/ascendente/
Carris Bus 758 from Cais de Sodre, Largo do Carmo (Chiado)
(Also from Sete Rios on the return route.) - http://www.carris.pt/pt/autocarro/758/ascendente/