The admissions for this event were much looser a few years ago than they are now, and you have to pass a test to even be considered as a candidate for the run.
Skellig Michael
You might recognize this place from the newest iterations of the Star Wars franchise. Located on the coast of Ireland, Skellig Michael Island was developed by Catholic monks nearly 200 years ago. There is a set of 600 ancient stairs that lead to the peak of this mountainous island, but there are no safety protocols there, and if a person does get hurt, you are nearly 10 hours away from the closest hospital.