The Gemara compares what a fetus can see with what a person can see in a dream. Does that mean that a person can see in a dream anything anywhere in the world?
There is a paranormal phenomenon known as "remote viewing" which is the ability to see things out of sight or far away, whether in a dream or meditation. Can we suggest that this gemara is a source for this concept?
Bumy Goldson, Beitar Illit
The Gemara (Berachos 57b) says that dreams are one-sixtieth of Nevu'ah. A Navi is capable of seeing both future situations and places he has not visited. The prophet Ovadyah describes the exiles in Spain and France despite not having visited them, while David ha'Melech describes the rivers of Babylon in detail without having been there.
Presumably a dream can also achieve this level, although only subconsciously and not through a conscious effort. Thus I doubt that this can be compared to remote viewing which is a form of "lucid dreaming" or an ability to consciously imagine places not within one's purview.
Moreover, the Gemara elsewhere (Nedarim 8b) says that all dreams have some part which is invalid, implying that there are other aspects which cannot be taken seriously. This is due to the subconscious mixing aspects of one's conscious existence within the dream.
Yoel Domb