O’Neill was also responsible for the construction of the Tower of San Sebastián and the Casa de Santa Maria, both in neighbouring Cascais.

Originally known as the Torre de S. Patrício (Saint Patrick Tower), the building was designed by the Portuguese architect Raul Lino.

In his will of 1974, in addition to leaving significant sums to the charity Santa Casa da Misericórdia de Lisboa, he left the house to the Municipality of Cascais, to be named after his wife and used as a museum and public garden.

In 1994, the composer Fernando Lopes Graça, who had previously worked closely with Giacometti on his research, left many items to the Municipality of Cascais in his will and these were incorporated in the museum in 1995.

[7] Instruments to be seen are guitars, mandolins, accordions, flutes, bagpipes, concertinas, drums, tambourines, and idiophones, such as castanets, ferrinhos, and lamellophones.