Hexxit Adventures Pt.2

Recently in Hexxit I found an odd portal in the middle of no where. I investigated inside and found a stone ruin. In the stone ruin I found some chests and more portals. There was also a creepy music playing.It gave me the creeps! Here is a screenshot, so if you can tell me what this place is, I'd appreciate it.

Minecraft Fort

So, sorry I haven't been posting a lot lately, so I wanted to show what I've been working on. Here is a fort I have been working on.

This is what I started with.

This is the front of the fort. The wood logs open with pistons. More pics coming soon!