The horizon is an infinity.
The cape is located within the Sintra-Cascais Natural Park, 42 kilometres northwest of the urbanized area of Lisbon and 18 kilometres northwest of Sintra. Its location (38°47′N 9°30′W) is inscribed on a stone plaque, located on a monument at the site.
http://en.wikipedia.org/wiki/Cabo_da_Roca