Although visiting and sightseeing look very similar, there are still differences. The differences are as follows:

The purpose of "sightseeing" is mainly to play, and the objects are places of interest and scenic spots. Most of the places I have been to are one place. There are too many places to visit in Beijing.

The purpose of "visiting" is to learn, and the objects can be places of interest, scenic spots, units and regions where you can learn. The teacher showed us around the steel plant.