I know we Muslims are not allowed to go the places where there are statues, idols, and polytheism, but can we Muslims go to museums if we avoid all the statues and go there for study and knowledge purposes?

Say what?

Islam forbids the making of such pieces, I'm fairly sure that it is not haram to visit them.

As a side issue what on earth is the black stone at the Kaba’a in Mecca if not an idol?

Please learn as much as you can. It may help you to realize that you're being lied to.

There isn't now and there hasn't ever been any credible or verifiable evidence of anything supernatural.

Everything that we've ever discovered the answer to has turned out to be not magic.