Excavation by denomination

Way back when in olden days
they would build masonry domes
and for support, in a number of ways
they would pile up dirt to support the stones.

When the dome was complete
they’d remove all the dirt,
the dome was left: what a feat
it didn’t fall, nobody hurt

But how’d they get the dirt removed?
it surely was a lot of work
to haul it out so space improved
peasants didn’t want to shirk

responsibility to their king,
so the Lord would hide some money
in the dirt, was the thing
which peasants kept, kinda funny.