King João V's 18th-century aqueduct, which survived the 1755 earthquake unharmed: the visit takes you onto the Alcântara section, the stone arcade that crosses the whole valley, with 35 arches, the largest 65 m high.
- Address
- Calçada da Quintinha 6, 1070-225 Lisboa
- Hours
- Tue-Sun 10:00-18:00; closed Mon and public holidays (EPAL, 2026)
- Best time to go
- Morning, Afternoon · About 1 h
- Price
- EUR 4 self-guided walk across the arches (EPAL Museu da Água, 2026)
- Price level
- €
- Free entry
- First Sunday of the month; 22 March; 18 April; 18 May; 1 June; 5 June; 1 October
Details can change. Check hours and prices before you go.
Good to know
- Enter at Calçada da Quintinha 6 in Campolide, not from the valley floor.
- Free on the first Sunday of the month.
- Guided walks of 2 km (to the Mãe d'Água reservoir) and 3.5 km (to São Pedro de Alcântara) run by booking.