create a directory off root
create a .htaccess file with the below contents and place it in that directory
Code:
<IfModule mod_rewrite.c>
RewriteEngine Off
</IfModule>
create an empty index.html file and place it in that directory (This is to prevent directory browsing)
Then you can create any html file in that directory you want without having the URLs redirected. You can create other directories as well.
/directory-name
.htaccess
index.html
somepage.html
anotherpage.html
sitename.com/directory-name/somepage.html
sitename.com/directory-name/anotherpage.html