De Grey Mausoleum, Flitton, Bedfordshire, England. Another historic site I used to manage.
De Grey Mausoleum is among the largest sepulchral chapels attached to any English church, this cruciform mausoleum houses a remarkable sequence of 17 sculpted and effigied monuments, spanning nearly three centuries (1615-1899), to the De Grey family of Wrest Park (another historic site I used to manage).
Henry Grey, the sixth Earl of Kent, founded the mausoleum in around 1605, and was buried here in accordance with his will of 1614. This started the accumulation of one of the greatest collections of family funerary monuments in England.
It is open to the public and managed by English Heritage.