I visited Pompeii in 1968. They said that only about 10% had been excavated. What I saw was amazing, especially the casts of people fleeing the pyroclastic flow. Back then there were no signs saying “don’t touch” and no roped off areas. We just wandered around until incredibly hot sun forced us to leave. One in our party suffered classic sun stroke.
We also visited Pompeii in 1968. Next to the excavated zone there was a grassy plain underneath which the rest of Pompeii still lay buried.
In the middle of the grassy plain there stood an abandoned villa, looked early 20th century. Probably gone now.