How to skip certain folders (for url to work) within WordPress?

I just installed WordPress on my domain, but I have folder inside, precisely gallery. domain.com/gallery, However, domain.com is wordpress installation. Whenever I click domain.com/gallery it goes to error page within WordPress. How can I skip this particular folder?

note: I’ve searched the forum but couldn’t find. I could not even figure out what could be the search tag also though I tried about 7 times with different keywords and descriptions.. very sorry ??