Are Triple Points and Critical Points Theoretical or Observable in Real Life?

[terp.asessed]

I just read an article with a phase diagram, and I am curious if triple point and critical points are SIMPLY theoretical (just in mind) or are they possible in real life (observable in real life)? I understand what they represent, but I am curious.

 

[Vanadium 50]

They are real. If you Google (images) for "triple point of water", those pictures that are not graphs show water at its triple point.