A time-lapse video of this scene can be viewed here
From the photographer: "The rock structure in this image is a picturesque landscape situated in the middle of a big city. This great 'refuge' is called the 'Peace Park' ('Parque da Paz' in Portuguese). This 60 hectare urban park is located in the center of Almada, and is a breath of fresh air for those who live in the turmoil of big cities and rarely get to glimpse more than a few stars in the night sky." - Miguel Claro
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