He found two skulls of this animal at the Grand Staircase-Escalante National Monument,in southern Utah.

VOA: special.2010.10.05

If you go inside, there's spiral staircase that goes all the way up.

如果你进去，会有一个旋转阶梯通向顶端。

万丽酒店的魅力 - SpeakingMax英语口语达人