Here’s a thread explaining why Saruman lived in the tower of Isengard. https://www.reddit.com/r/AskScienceFiction/comments/33b4v3/l...
I'd also point to the towers of ancient times being places where astronomy and astrology where practiced and the linkage between astrology, divination, and wizards.
A single tower that you live in is also a castle.
He was the only one of the three named wizards in LOTR who lived in a tower. Gandalf didn't really have a fixed abode and Radagast lived in tune with nature, on the western side of Mirkwood.
If it weren't for Tolkien there may not even have been a D&D. I'm in line with Saruman.
Does it? It has a wizard, and later there’s the mountan peak with Chernobog, but no wizard’s tower, from what I recall.
Fantasia was a Disney animated movie from 1940, but did not, as I recall, feature a wizard’s tower.