I followed his pointing finger.

In the wall at the end whirled two enormous dragon shapes, cut in low relief.

Their gigantic wings, their monstrous coils, covered the nearly unbroken surface, and these CHIMERAE were the shapes upon the upthrust blocks of the haunted roadway.
In Ruth's gaze I read a nameless fear, a half shuddering fascination.
But she was not looking at the cavern dragons.
Her gaze was fixed upon what at my first glance seemed to be a raised and patterned circle in the dust-covered floor.

Not more than a foot in width, it shone wanly with a pale, metallic bluish luster, as though, I thought, it had been recently polished.

Compared with the wall's tremendous winged figures this floor design was trivial, ludicrously insignificant.