In Chapter Ten, they see what they think is a fire but actually turns out upon further investigation to be the reflection of the sun on the glass of a house's windows. The house has two stories, a flat roof, and many windows, and it is made of the same hard substance as his secret tunnel. They realize without speaking that the house must be a remnant from the Unmentionable Times, hidden by the trees from time, weather, and man.
Neither Equality 7-2521 nor the Golden One are afraid, so they enter the house of the Unmentionable Times and explore the house. The rooms are small, suggesting that only a few people lived in the house, although they find it hard to imagine that men were allowed to live in such small groups. The rooms are full of light and color, and the glass on the walls reflect instead of being transparent.