Dinas Powys Quarry as Fatality Index
The Doctor remembers the execution of Misty from long ago.
Source: dw-location-hunter — Tumblr
“Extremis” Filming Locations
The Doctor investigates a mysterious book leads to the suicide of anyone who reads it and the secret of the vault is revealed.
Doctor Who episode “Extremis” was filmed in Cardiff in the United Kingdom.
National Museum of Wales as St. Luke's University (lecture hall)
The Doctor is standing in the dark hall when representatives from the Vatican arrive to request his help.
Cardiff School of Management (Cardiff Metropolitan University) as CERN
Bill and Nardole attend the suicide party of a bunch of scientists and learn the truth of reality.