Situation:
You have a site (eg. www.mysite.com) and a page of this site dedicated to photography (eg. www.mysite.com/photography.html) . For some reason you buy another domain (eg. www.photosite.com) and want to render your photography.html page below this new domain.

Solution:
Use a htaccess file running Apache server to solve that. How?

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^$ photography.html [L]
RewriteRule ^(.*)$ http://www.photosite.com/$1 [P]

And upload it to you new domain renaming the name to .htaccess .

Explanation:

  1. First rule will redirect www.photosite.com to www.photosite.com/photography.html
  2. Second one will "render" every www.mysite.com/any-site-page.html under domain www.photosite.com, and keeping this url domain even navigating between different pages (that's why there's a [P], standing for Proxy).

Hope you you find it useful.