Barcelona's Montjuïc is a broad shallow hill with a relatively flat top overlooking the harbour, to the southwest of the city centre. The eastern side of the hill is almost a sheer cliff, giving it a commanding view over the city's harbour immediately below. The top of the hill (a height of 173 metres) was the site of several fortifications, the latest of which (the Castell de Montjuïc) remains today. The fortress largely dates from the 17th century, with 18th century additions.