Cerro de los Angeles (literally "Hill of the Angels") is a little hill a several kilometers south of
Madrid. It's sort of in the middle of nowhere and is really only famous
for one reason: it's considered the geographic center of the Iberian
Peninsula (which is composed of Spain and Portugal). It also has a small
14th century monastery and a large monument with statues of religious figures, including a pretty
large one of Jesus (sort of Rio-Christ-the-Redeemer-style), on top. Although not a hugely fascinating
place, it is a pretty little hill with parks and good views of Madrid.
The hill is supposedly at an elevation of 666 meters above sea level, but I've read in different places that it's actually 670 meters, or some other number in the 660s, which, really, is better, because I wouldn't even know how to analyze Spain's building a nice big religious monument named "Hill of the Angels" at Satan's earthly altitude. Although - I suppose Satan is the fallen angel, so technically the name isn't inaccurate?