The Keston Roman villa is an archaeological site in Keston in the London Borough of Bromley, England. The villa consisted of several buildings including a mausoleum. The latter is preserved above ground.
Excavations at the villa were carried out over the last hundred years. A sarcophagus was found by farmers around 1783. In 1828 the first proper excavations were started uncovering a round mausoleum and another sarcophagus. Another excavation in the same year uncovered the same structures and was published in detail in 1829.
Wikipedia https://en.wikipedia.org/wiki/Keston_Roman_villa
Coordinates 51°21'3.92" N 0°1'48.193" E