Astalavista recently added 14 challenges of the new category "Real Missions".
For these real missions you have to access different boxes via VPN and exploit real vulnerabilites, including:
Also i want to correct myself here.
In the news i wrote there are 8 boxes for shell challenges available. but most of them have only been planned.
Meanwhile there should be around 12 boxes available, awaiting your exploitation.
Finally some more real hacking challenges listed here