This video is called History of the Faculty of Archaeology in Leiden.
During the first months of 2015, there will be digging in the inner city of Leiden, to put underground waste containers in the holes. These underground waste containers replace waste bags which are vulnerable to damage by herring gulls and lesser black-backed gulls nesting in the city.
The digging for the containers is an opportunity for archaelogists. In 26 of the inner city holes, archaeologists will look for new discoveries in Leiden medieval history.
A map of places where there will be archaeological research is here.