Towers (Ultima II)

The foreboding Towers first appeared in Ultima II: Revenge of the Enchantress. They were similar in many ways to Dungeons, but grew more difficult the higher one climbed -- and they could be as tall as 15 stories. Towers were known for their oddly-placed cryptic writings.

This curious breed of architecture disappeared once Minax was slain by the Stranger and the timeline returned to normal.