content: the cat and ebe had long since gone on their way , and had wandered far and ever farther over hill and rock . in the evening , at dusk , they came to a royal castle that glittered and shimmered as though it were of the purest silver and gold - which it was . yet it was gloomy and depressing , and lonely and barren there , and nowhere was there a sign of life .
answer: the purest silver and gold .
question: what was the castle made of ?
target: what was the castle made of ?
references: what was the castle made of ?