I have recently been spending time studying archeology. I found out that a great many of the great stone works of Europe, Places like St. Petersburg, Moscow, Berlin and many other places ended up in the fill for modern construction. When Looking at pictures of new buildings (post WWW2) the fill under the foundations are packed with unbelievable master works. The rift rafte of rail and rivers are full of beautiful stone sculptures, The site said that some of the old savable small bits are incorporated as a lintel here a corner there. Wouldn't it be great to walk the fill sites Rails or river banks for a cherub or leaf or a festoon. Fred
It used to be common practice when sacking a city to haul home stone from destroyed buildings and use it in your new construction. The walls of the Duomo (cathedral) in Pisa have many ancient pieces set in, often deliberately set upside down or sideways... a way of saying that the enemies monuments and treasures are only good enough to be our fill or rubble.
In this photo of the Pisa Cathedral, note the two lettering stones on the right, the ornamental band above, and the rosettes- none in a location that makes sense from a traditional architectural ornamentation standpoint.