Dragon staircases are found at many of the entrances to the Great Underground Empire. While these spiraling staircases appear normal, complete with steps, the tail of the ornamential reptilian railing is enchanted, and is used for lifting travellers from top to bottom (and vica versa) instead of forcing them to climb the heavy train of stairs.

IMAGE01: Dragon Staircase, tail ready to lift up
IMAGE02: Dragon Staircase, tail ready to lower
IMAGE03: Dragon Staircase (A) / (B) / (C)

SOURCE(S): Zork Grand Inquisitor