The Last Egyptian by L. Frank Baum

Kāra went to the cavity beside the arch and took from it a small bronze lamp. It was partly filled with oil, on the surface of which a cotton wick floated. The lamp itself was of quaint design, and the young man remembered it since the days of his childhood, but had rarely seen it in use.

Having lighted the wick and spread it with his fingers until it flamed up brightly, Kāra turned his back to the arch and carefully examined the rear wall of the room. The house, as has been explained, was built against a shallow cave of the mountains; but, owing to the irregularity of the hollow, part of the rear wall was of solid masonry, while the other part was formed by the cliff itself. Kāra had never before paid much attention to that fact, but now it struck him as very evident that the masonry had been constructed to shut off an orifice too deep or too irregular to be utilized as part of the dwelling. Otherwise, the continuation of the cliff would have rendered a wall unnecessary. The stones were of large size and were built up and cemented as far as the overhanging rock that formed the greater portion of the roof.