Painshill Park, Surrey
The building had fallen into disrepair, the roof having collapsed and the floor lost.
The Mausoleum at Painshill was built to look like a ruined Roman arch. The building was intended to provoke melancholy thoughts and Charles Hamilton surrounded it by sombre yews.
Parts of the walls remain, although the roof has been lost.
The arch was depicted in an engraving by William Woollett of 1760 and appears in a 1773 oil painting by William Hannan.
The Mausoleum also features in the famous 952-piece dinner service made by Josiah Wedgwood in 1775 for Catherine the Great which is decorated with over 1,200 views of Britain, including country houses, parks, gardens, and ancient monuments.
Descriptions by 18th-century visitors showed that there had once been a mosaic-tiled floor.
Archaeologists found part of the original floor still in place, with a central tile-and-stone motif, surrounded by diamond-patterned red and cream tiles.
From these remains they were able to draw up a pattern for the floor to be re-laid.