Redirect to a welcome page instead of UnderConstruction page

I've tried to do the following, but I have not succeeded.

When a route is protected, instead of redirecting to the password entry screen, I would like the user to see a view with the web logo (for example). And, if he wants to enter the web, accessing an address like www.website.com/access he would see the Under Construction screen to enter the code.

Any ideas?