Deconstruction

 The Circus Maximus and the Imperial Palace, 200 AD and today.

Circus Maximus, with seating for about 200,000 spectators is located in the valley between the Palatine and Aventine Hills in Rome.  The Imperial Palace started in the 1st century AD, eventually expanding to occupy much of the Palatine.

Although some of the deconstruction over the centuries is due to the ravages of time, it was substantially aided by the use of the marble facing and stone interiors from both structures for constructing newer buildings in Rome.  Circus Maximus, located in a low area, was frequently flooded once the drainage system constructed by the Romans was no longer maintained, resulting in much of it being buried under tens of feet of mud, which has only recently begun to be excavated, revealing some of the remaining structure for the first time in centuries.