This soldier, guarding all the good stuff, is wearing a type of armor known as Lorica segmentata. Bits and pieces of it have been found from all over, but it wasn't until a bunch was found in a hoard at Corbridge along Hadrian's Wall that modern historians figured out how it all went together to work as a system of armor.
I saw that set of armor last year when visiting Corbridge on a day trip out from Hexham.
They've got a large collection of coins on display going back to Greek times, but also covering the Roman, Byzantine and Medieval Serbian periods.
Here is a coin of Galerius, whose palace Felix Romuliana I checked of earlier.
Also, a coin of Constantine. Think the coins match up to the busts?
Anyways, enough coins. Lets get to other cool stuff.
Here is a statue of Hygeia in porphyry. She is the goddess from whom we get the word hygiene.
This is a section of bronze railing found at Mediana which appears to have enclosed a shrine to Hygiea in the main hall. The sections of railing are separated by what are called Herm sculptures of Lune (see the moon crescent?) and Asclepius, another major figure of the healing pantheon, from whom we get the near universal medical symbol of a serpent wrapped around a staff.
The wikipedia article has a much better example of a similar depiction.
I've been to a bunch of Roman sites over the years and this is only the second diploma I've seen
This diploma was awarded to a soldier named Caius Aurelius Valens in the year 222 AD, over 1800 years ago. It would likely have been this person's most prized possession.