This is a pretty simple thing to do, tested it out just earlier and works great. Took me 3 tries, but I got in. 
**MAKE SURE YOU HAVE A SCROLL OF ESCAPE BEFORE DOING THIS**
This works on any castle, but I got it to work with Dion Castle. Use your *ARROW KEYS* and continuously run into the door. While running, hit alt+x then "restart". Now log back in, and you should be in the castle. You can run into the throne rooms, and all around the walls. Pretty cool to see what sieges are going to look like from the inside.
Try it out, have fun!
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Lineage 2 Adena.
