The cave of time
Through computer instruction you are able to learn the language, which you find is similar to English, so you are soon able to communicate with your hosts.
They are not at all surprised to hear that you arrived through the Cave of Time.
“You are not the first,” the head of the household tells you, “but we have visitors from other times only once in a great while. When someone comes, we are always glad to learn about life in another era, because here we have achieved a sort of paradise, we do not work, and the world is at peace. It is a perfect society. That is why primitive epochs, such as yours, interest us so much.”