What is the point of going to Mars or the Moon?

What is the point of going to Mars or the Moon, besides having a look
around? One reason I could think of was for archival purposes, in case
some thing bad happened to the home world (Earth), there could be
re-establishment of civilization. It would be nice to come down like
aliens for afar, enlighten people, and get them rebuilding a few cities.
There are a lot of species with agricultural and farming use, but not
sure if actually need to store seeds/embryos, or the genetic data and
then make them up again with genetic engineering and a restore from digital.

Archival generally doesn't make economic sense, and is best provided by
government. Non-profit might make promises, but doesn't always deliver.
e.g. archive.org lost some data permanently a few years ago.

Also it would be nice to have a feature, visible with the naked eye on
the Moon, that showed a human construction. Should do some figures, but
maybe needing a basic x50 telescope would make the scheme practical.