Many years ago, there used to be http://www.tk/. They would let you register free domains (which I think technically were actually subdomains, but I'm really not sure). You could point these to anywhere online and it would maintain your [whatever].tk URL in the address bar. I remember hosting some pages on Geocities and using .tk to make it look "authentic" since it appeared to be self-hosted, which was 1337.

It seems that the service now redirects to a site called Freenom where you can still get .tk names, but they appear to be priced based on the length and whether or not the domain contains known words or phrases (though some free ones are apparently still available if you don't mind having a gibberish name)