Santa has left the building
.
Seriusly thoug, there has not been a mountain hollowed out.
Our Capital city is Reykjavík, but up north (about 400 km ) there is a city named Akureyri and they have a house called Xmas house that is open all year round. It´s very popular by tourists and actually natives too.
Yesterday I asked a co-worker if it wasn´t strange to go there in the middle of the summer as I know he has done and he said "no it´s great".