It appears that Thaumcraft modifies vanilla structures.

[Saice]

Title says it all.

I was exploring the area around my current project and spied this.


2013-02-01_23.29.17 by Saice, on Flickr

Nothing to write home about but hey the vis is a little high no worry lets go inside.


2013-02-01_23.29.30 by Saice, on Flickr

What? I can not see this as random the node is right in the center lined up with the blue wool on the floor.

Still cool find.

 

[ItharianEngineering]

Yep, and witch huts I believe also have nodes in/around them with similar qualities. I assume the jungle ruins would also be like this too.

 

[Zmaster27]

desert temples and witch huts are confirmed for large nodes inside. jungle temples i dont know about