And exactly what were you specifically looking for?

I just did a Google search for Valheim dungeons, and within 0.54 seconds, this popped up:

7,720,000 results came up. The first on the list is:
Burial Chambers (https://valheim.fandom.com/wiki/Burial_Chambers) followed by Category:Dungeons (https://valheim.fandom.com/wiki/Category:Dungeons).

Perhaps you should learn to use the Valheim forums first, before knocking it down due to your inability to post in the right places? ;)