The Tito Bustillo Cave is a prehistoric rock shelter located in the small town of Ribadesella. The cave was inhabited by humans (cro-magnon) before the year 10,000 BC. Due to the collapse of the rock, the original entrance to the cave was sealed thousands of years ago, which made it possible for preservation of objects, tools and wall paintings that were discovered in 1968. Based on those objects found in the cave, it is known that there was a significant human presence during the Magdalenian culture of the Upper Palaeolithic, but the cave was probably inhabited before that time.
The Tito Bustillo Cave has been designated a World Heritage Site, as part of the Cave of Altamira and Paleolithic Cave Art of Northern Spain, and it counts with 12 prehistorical paintings, making it one of the most complete examples of the prehistoric art in the north of Spain. The oldest of these paintings shows human figures and is around 33,000 years old, as determined by radiocarbon dating. Some scientists believe it could have been made by Neanderthals, though this theory hasn't been proven.
Some of the paintings represent animals: horses, deer, moose and even a marine animal (probably a whale) and they are believed to have had some kind of ritual purpose to improve their hunting. There is also a panel representing female genitalia and it is believed to have had the intention to invoke fertility. The oldest painting in the cave represents an anthropomorphic figure, part male, part female.
Apart from the paintings, some objects from the Magdalenian period were perfectly preserved. The most important ones are some harpoons made of bone and a carved staghorn of a goat head.
References:The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.