It is a mysterious under block shelter, that might have been occupied by a wolf once!
A recent theory explains that this place was part of an ancient pre-celtic sanctuary (-450 before Christ), sacred place related to astronomy.
During the winter and summer solstices, people can see the sun through two distinct natural holes that have been partially set up by mankind.
In front of the "cave", a largely held up platform enables you to gaze at the phenomena.
This sanctuary might be the proof of the astronomical knowledge of mankind at the beginning of the iron age.
All year round, daily.