1. The three things the speaker passes while she was in the carriage are a school where children play, fields of grains, and the setting sun.
2. The house in which the speaker paused at looks like as it was coming out of the ground. They could barely see the roof, and there were no walls attached to the house.
3. The house is probably best described as unkept and abandoned. In the fourth stanza, it states that "the roof was scarcely visible," which I interpreted to mean that the roof was barely stable
