...on the door could be grafitti from the Roman army...

It's latin and loosely translated is:

Sursum corda: Lift your hearts...

Credo nos in fluctu eodem esse: I think we're on the same wavelength...

Malum consilium quod mutari non potest: It's a bad plan that can't be changed...

Cogito ergo deleo: I think therefore I am depressed...

Hic sunt dracones: Here be dragons...

Ut sit magma, tamen certe lenta ira deorum est: The wrath of the gods may be great, but it is certainly slow...

jimHJJ(...pax vobiscum...)

P.S. Missed one... Aegrescit mendendo: the cure is worse than the disease...