Wormholes in the Solway

We walked out on the mud at Bowness-on-Solway. There were a lot of wormholes. Einstein's vision of the Universe as a curved multi-dimensional surface of space-time leads to places where the surface curves back under itself. Then it is possible for "tunnels" to be opened up between the two different sections of space-time. These "tunnels" are called wormholes. If you were able to pop through a wormhole you'd immediately appear in another place at another time, I think. That's certainly the science fiction reading of it, but I was interested to see on the Wikipedia page https://en.wikipedia.org/wiki/Wormhole that wormholes arose as solutions to the Einstein field equations. Sounds like it is back to Roger Penrose's Road to Reality book to get myself a bit closer to those equations!