This artificial waterfall is found in the Gardens of the Palace of Monserrate, one of the most important English landscaped gardens outside the British Isles and one of the most beautiful landscape creations of Romanticism in Portugal...
Rua Barbosa du Bocage, 136 2710-405 Sintra
Sintra
William Beckford fell in love with Sintra by sub-renting Monserrate to Gerard de Visme in 1794. In order for the waterfall to exist, Beckford had artificial dams built to ensure the constancy of the waterfall.
Source: https://visitsintra.travel/pt/visitar/miradouros-e-cascatas/cascata-de-beckford-monserrate