Interesting review in the Times of David Watkin, The Roman Forum … here’s a pair of excerpts:
A caption in the exhibition on the Emperor Vespasian currently in the Colosseum describes the Arch of Titus – only a few hundred yards away – as one of the best-preserved monuments from the Flavian dynasty. Yet what we have now is largely a nineteenth-century reconstruction. In 1819–22 the neoclassical architects Robert Stern and Giuseppe Valadier pulled down the private houses that had encroached on the sides of the arch and thoroughly rebuilt these sides together with the attic, using travertine instead of the original Pentelian marble. The inside of the arch includes the famous relief celebrating the taking of Jerusalem, with the Menorah looted from the Temple prominently displayed. Indeed until 1846, when the ceremony was abolished, every new pope’s inaugural procession passed through the arch, where a Jew was obliged to stand and pay homage to the leader of the Roman Catholic Church.
Both facts – the evolution, as it were, of Titus’ Arch, and its use in papal pageantry – not to be found in most guidebooks, are relevant to David Watkin’s excellent, handy new book, whose main object is to see the Forum not as it looks now – “a long, clean, livid trench”, as Émile Zola wrote in 1896, in which “piles of foundations appear like bits of bone” – but through its metamorphoses over more than 2,000 years, when every age has left its mark. The Forum only ceased to be lived in, by both people and animals, in the second half of the nineteenth century, when it was turned into an open-air museum, and archaeologists imposed the view that whatever was Roman must be retrieved, and whatever they considered irrelevant, removed. Uninterested as they were in Baroque architecture, which after all shapes modern Rome much more than relics from antiquity, they ruthlessly destroyed several Baroque churches from the seventeenth and the eighteenth centuries; these churches are now recorded only in Piranesi’s incomparable etchings.
[…]
Professor Watkin acknowledges that excavations made such monuments as the great Arch of Septimius Severus much more visible than they had been for centuries, but he argues that in most cases only the foundations – that is, holes in the ground – were unearthed, to be exhibited to the visitor with stones of no visible meaning. Even more questionably, edifices have been reconstructed from small fragments, much in the way a dinosaur might be assembled from a single cartilage. Today’s much-admired Temple of Vesta, for instance, in truth dates from the 1930s.
That seems a bit misleading as worded (by the Times … I’m sure Dr Watkin has a less controversial spin). Reading the description of the Temple in Platner (via Lacus Curtius) one will see that although it was just the podium and ‘various architectural elements’ which were found during various excavations, there was/is quite a bit of documentation from coins, reliefs, etc., of what the Temple looked like. I don’t think we’re in the same sort of ‘use your imagination to reconstruct things’ world like Evans did at Knossos …