The Cantabrian caves' unique location make them an ideal place to observe the settlements of early humans thousands of years ago.
The magnificent art in the caves includes figures of various animals of the time such as bison, horses, goats, deer, cattle, hands and other paintings.
This cave contains rock art, including two bison carved and painted in red, a doe, a horse, a clavate (club), a sign on the grill and several more configurations.
The cave of Cualventi is located in the town of Peralada, in Oreña in the municipality Alfoz of Lloredo dating approximately to the Magdalenian age.
Cullalvera Cave is located in the municipality of Ramales de la Victoria, capital of the comarca of Valley of the Asón River.
The entry for this cave near the village arises from a Cantabrian oak, and it is part of a karstic complex about 12 km (7.5 mi) in size, in which a multitude of geological forms shaped by water over the course of thousands of years can be found.
It is located at the confluence point of several rivers and Nansa Lamasón in an environment with steep slopes amongst other caves with rock art.
Even though the cave is small and of profound simplicity it subtle red paintings of deer, goats and cattle which are represented very schematically and a large number of symbols.
It is notable for paintings in a large room representing horses and other signs which are not identifiable, dating from about the Aurignacian or Gravettian cultural periods.
Fuente del Salín Cave is located in the municipality of Val de San Vicente, and contains an archaeological site discovered in 1985.
It is a cavity of 500 m (1,600 ft) length with a particularly narrow labyrinthine structure, in which some flint carvings have been found, such as nodules with signs of having been worked on and a chisel.
The La Chora Cave is located in San Pantaleon de Aras and includes a number of chert items as well as flint blades and scraper backs and Magdalenian bone harpoons.
Archaeologists have found many items of interest in this site, such as the famous body cast of the so-called "Man of Morín" dating from the Middle Paleolithic.
Cave of Ruso was discovered in Igollo, Camargo and provided materials from the Paleolithic and Bronze Age which were, as is traditional, moved to the Museum of Prehistory of Santander.
It is admired worldwide for the quality and quantity of geological formations or speleothems contained in its 17 miles in length, although only 6 are open to the public.
There are rare formations as helictites (eccentric stalactites defying gravity) and "draperies" (sheets or translucent banners hanging from the ceiling).