When Haldane is shot by Noukakis at the end, and is transported to hospital, the exterior entrance is shown. I found a YouTube video of the old exterior of the Venizeleio Hospital in Heraklion (near to Knossos). Check out the Episode 8 page for more information.
Who Pays The Ferryman? Locations Page
Delving into the locations from the 1977 BBC TV series "Who Pays the Ferryman?"
Who Pays The Ferryman? Locations Page 