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Did you ever hear of a tell? In archaeology a tell is an artificial hill formed by generation after generation, century after century, of people living in the same place.
A tell is an artificial hill created by many generations of people living and rebuilding on the same spot. Over time, the level rises, forming a mound.[9] The single biggest contributor to the mass of a tell are mud bricks, which disintegrate rapidly. Excavating a tell can reveal buried structures such as government or military buildings, religious shrines and homes, located at different depths depending on their date of use. They often overlap horizontally, vertically, or both. Archaeologists excavate tell sites to interpret architecture, purpose, and date of occupation.
A classic tell looks like a low, truncated cone with sloping sides[3] and can be up to 30 metres high.[4]
https://en.wikipedia.org/wiki/Tell_(archaeology)1
In Rome, the Baths of Trajan, opened in AD 109, were built over the first floor of an important wing or range of the Golden House of Nero built about AD 64 to 68.
Some of the really old churches in Rome that are 1,500 year old are surrounded by ground much higher than their floors so you have to walk down steps to the front doors. At other churches one or two older churches are buried beneath the present ones, and in some cases tourists can tour those bas*m*nt churches which were at ground level when they were built long ago.