Spanish Treasure Vaults.

Now I hunt for Spanish Treasure Vaults. They have been around and many have searched and I suppose found these vaults. I am just learning and reading all I can to see what works for me.  I will do more in my home state but also open to anything in the southwestern United States. These vaults are located mainly due to signs left in the rocks and sometime other means.  They are associated with the Kings 5th so some of these vaults could be substantial.