Erris

Erris is a remote but beautiful corner of Ireland which was given its name when the first settlers discovered they could go no further west. The name translates as 'Westernmost edge of the known world' and people now come to immerse themselves in its pristine timelessness. However, Erris is also a 'Thin Place', so called by the Ancient Celts because the boundary between our physical reality and the metaphysical reality that parallels it, can become unstable for those inside it.
There are many reasons for this phenomena but prime amongst them are undocumented histories. We like to assume for expedience that someone always survives to write history down for us to study later, yet we know this can't always have been the case. Histories that were not written still happened. It's just that they are written in something other than words.
In a place where time and reality are historically acknowledged to be in flux, we can't assume that our four dimensional reality is a default value. That in turn means that we need to be very careful regarding just how immersed we want to really get.