Otherworld (1985)

Other worlds lie outside our seeing.
Beyond the beyond. At the edge... of within.
The Great Pyramid, erected by the ancient ones as a barricade.
At the portal between two dimensions, two separate realities.
This is the story of one family, drawn through a mysterious vortex into the other world
and of their perilous trek homeward.

While sightseeing in Egypt, the Sterling family gets lost wandering around inside a pyramid. Once they manage to find their way out of the labyrinth like interior, the Sterlings discover that they've been transported from Earth to another planet, where the people aren't the friendliest beings in the galaxy. Now the Sterling family must make their way to the province of Imar, where Signpost Astrologers may be able to help them find their way home.