石窟

shíkū
  1. rock cave
  2. grotto
  3. cliff caves (often with Buddhist statues)

CEDICT

Entry Composition

1 石 shí
  1. rock
  2. stone
  3. stone inscription
  4. one of the eight categories of ancient musical instruments 八音 bāyīn
2 窟 kū
  1. cave
  2. hole