As most of us know, the Egyptians are so well represented in the mod, and there aren't really many other civilizations other then Aztecs and almost non-existant Vikings, so here's some ideas for a Roman culture. I picked the Romans because they're my favorite ancient civilization.
I'll edit the rest in later, for now, it's sleepy time.
1: Pompei
Pompei would be a very rarely spawning smallish town, that is covered in a thick layer of Volcanic Rock and Volcanic Ash. It would contain a lot of destroyed buildings, which would have some valuable stuff.
2: Pantheon
The Pantheon would be a HUGE long building made out of Ancient Stone Bricks and Stained Clay, that contains altars and temples of each Roman god. The statues of the gods would all be cracked and burned, symbolizing that they've all vanished.3: Coliseum
The Coliseum is just what you would expect; a big ass round building. It should be about 50 blocks high and made out of cracked stone.
4: Forum
5: Roman Encampment (War Camp)
A Roman Encampment would be a military Roman camp, out in the middle of nowhere. It would have one block thick wooden walls with broken down gates, some guard towers, a barracks, an armory and a big middle building for the commander.
6: Roman Weapons
7: Roman Books
These would basically be the Roman version of the Stone Tablets, the difference being that these books actually inform you of things. They would contain broken bits of information, vaugely explaining why their civilization died (Anu!) and what dinosaurs they had and stuff. It would display in Latin, so you would have to run it through the Translator (my other idea). You would have to find all of them and translate them to fully figure out what happened.
8: The Aquila
Now I know what you're thinking: "Uncle Adsper, what the fuck is an Aquila?". Well I'll tell you sonny boy! The Aquila is the extremely important eagle symbol of the Romans that is always carried into battle. It was so important to the Romans that only 2 to 5 of them were ever lost in the history of Rome. It could be a very rare find from either Pompei, the middle building on an Encampment, or in the Pantheon. I don't know exactly what it should be for other than decoration, so leave your suggestions plox. It would look something like this, except gold.