Just inside the main south entrance to York Minster, a set of stairs lead down into the Crypt and Undercroft. This is the oldest part of the Minster - and some of the remains you will see here pre-date the Minster by quite a bit!
Much of the Undercroft and the Crypt has been turned into a modest museum showcasing artefacts found on the site and explaining how the Minster is built.
Fragmentary remains of Roman plasterwork can be seen, as well as foundations of the nave walls. Comparatively recent is the 10th-century grave marker in the undercroft.