Viewing of the outdoor gardens at the Fishbourne Roman Palace in Fishbourne, England.  The palace (or villa) is the largest known Roman residence north of the Alps, dated around 75 AD, around thirty years after the Roman conquest of Britain.  Much of the palace has been excavated and is preserved, along with an on-site museum. The rectangular palace surrounded formal gardens, the northern parts of which have been reconstructed.  Extensive alterations were made in the second and third centuries AD, when many of the original black and white mosaics were overlaid with more sophisticated coloured work, including the perfectly preserved Dolphin mosaic in the north wing. More alterations were in progress when the palace burnt down in around 270 AD, after which it was abandoned.  The site was discovered accidentally in 1805 during construction of a home excavations starting in 1960 & later 1995-1999 revealed over 12,000 artifacts.  The garden is constructed in a way to mirror how it may have looked during Roman times.  From here, several more excavations revealed five additional mosaics, however this area has been filled over with dirt & landscaped.

More info here: https://en.wikipedia.org/wiki/Fishbourne_Roman_Palace