Hidden city in out of bounds ocean
My uncle would play the original oblivion for days, his favorite glitch was the floating paint brushes that let you scale out of bounds
He traveled on foot across the entire low lod map from the center city to the top left of the map
He was just walking across the ocean with water walk boots then he came across a floating patch of grass then another then invisible ground appeared allowing him to remove his water walker boots and walk normally
He followed it for 20 minutes or so till he came across this random city gate sitting attached to city tower, it had a pillar of dirt holding it all up
When he entered it was just this random city layout with npcs wandering about
This was on the Xbox 360 I believe so I know he didn't mod it to just fuck with me