"Het Solse gat" has quite some history. It is located in one of the most ancient forests in Holland, the speulderforest and it is said it excists since the ice age. According to the urban legend, there was once an evil monestary, ages ago, built by monks who sold their soul to the devil. At night all the witches and ghosts would come to join the monks and their evil ceremony.
This lasted till one stormy christmas eve when there was a big bang to be heard and when the people from the town went to take a look in the forest, it was swallowed by the earth. Since then, there is a pond where once the monestary was located and at midnight there are still sounds from the bells of the old monestary to be heard and shadows of the monks are to be seen around the pond.