Upvote:0
Take a look at Colchester Castle, built on the base of the temple of Claudius, destroyed at the time of Boadicea. You can see an oyster shell from Roman times in the vaulted bas*m*nt of the castle; it is embedded in the concrete.
Upvote:1
https://en.wikipedia.org/wiki/San_Clemente_al_Laterano
Saint Clemente Basilica in Rome, a three-tiered complex of buildings:
I have visited 1) and 2). In (2), you can see the nave (although, as the roof is the floor of the next level, it has a low height) the tombs of Saints Cyril and Methodius, the Apostles of the Slavs - orthodox people also go there to visit them - and, in a lower level, the mithraeum, where the pagans would sacrifice animals, there are benches, altar, and channels where the blood would flow.
The different levels are obviously built with different architectural styles and materials.
some pics: https://lavieboheme2010.blogspot.com/2013/09/the-four-worlds-of-basilica-san-clemente.html
Upvote:2
There are plenty of examples of Roman buildings and structures reused, rebuild, repurposed or build over in Medieval and later times.
One example: Casa de l'Ardiaca in Barcelona, a medieval and later renaissance palace built on the Roman wall and reused, reformed and repurposed until our century.
Another example where medieval rebuilding appears clearer: Chapel of Santa Γgata, also in Barcelona, a Gothic chapel build on top of the Roman wall - by then no longer needed as a city wall because Barcelona had a larger wall.