Roedd eu hymweliad, a drefnwyd gan Wasanaeth yr Amgylchedd Hanesyddol (Cadw) Llywodraeth Cymru yn cynnwys ymweliadau â threfi Biwmares, Caernarfon, Blaenau Ffestiniog a Chonwy.
Their visit, which was hosted by the Historic Environment Service (Cadw) of the Welsh Government included visits to the towns of Beaumaris, Caernarfon, Blaenau Ffestiniog and Conwy.