To be fair, rare are the roman buildings that survived in good condition. There are some beautiful counter examples, like for example the Rome Pantheon, but th

To be fair, rare are the roman buildings that survived in good condition. There are some beautiful counter examples, like for example the Rome Pantheon, but this building, being converted as a church, as been correctly maintained most of the time up to now. Long standing (and sometimes beautiful) structures are still up because of proper maintenance, they can endure some kind of neglect for a few decades, but not a lot more. Maintenance is the key. (an even bigger example that comes to my mind is Hagia Sophia, which, in spit of being in a seismic area and being quite tall, is still standing today after ~1500 years). As for the ruins, given the proper conditions, even your shitty bathroom can be preserved. Maybe not yours specifically, but one of the millions others like yours. Keep in mind that the Roman Empire spanned across most of southern Europe, the middle east and North Africa, that multiplies the "proper conditions" opportunities.