OK, let’s say you’ve changed your master page so that there’s no link to the Recycle Bin showing. Next, let’s say someone accidentally deleted a file, and you really need it back. And finally, you don’t remember how to get to the recycle bin. No worries —

You could go into the HTML source of your master page and search for ‘recyle bin’, to get the url for it.
Or, you could just go to the root of your site collection and add:
/_layouts/RecycleBin.aspx

Like I said earlier ‘no worries’.