Diaz Ancestral HouseDiaz Ancestral House is a Local Cultural Property - Cultural and Historical Heritage of the Province of Ilocos Norte (per Provincial Ordinance Nos. 049-2006 and 039-2009); Registered Property, Municipality of Paoay; Registered Property, Province of Ilocos Norte located at Paoay, Ilocos Norte, Region I.
Formerly the ancestral house of the Claros family, it later became known as the Diaz ancestral house when Don Marcelino Diaz, former mayor of Paoay, married Emilia Claros and used it as theirs. It is one of the better preserved bahay na bato structure in Paoay that resembles the predominant architecture of Vigan houses, except that the main staircase is also found outside. The complex features a brick drainage that leads to the nearby creek, a brick well, and several arches. The addition of terracotta tiles on the first floor was made 2008-2009. At present, it is owned by the Marcelino Diaz Memorial Foundation.