Real Instituto y Observatorio de la Armada
The Royal Institute and Observatory of the Armada in San Fernando is one of the most important scientific centers in the world.
It has a spectacular library consisting of over 25,000 volumes and some pieces of great value. At a scientific level this is where the official time of Spain is established and it has a set of atomic clocks that establish and maintain the scale of universal coordinated time (UTC-ROA).
For more than a century it holds the honor of being the first geomagnetic observatory in Spain and it also has a seismograph station.