"I suppose this is a trap.

The ground over it was as solid as anywhere, to all seeming.

I was nigh into it." The pit was ten feet deep or so, and it was plain that out of it had come what made the mound, though one could not see how.

When I looked in I saw that the ground had given way over the roof of a passage hewn in the soft chalk, and that the opening of it must have fallen in long ago.

The twisted stems of the sparse heather on the mound and all around it told of years, if not of long ages, that had passed undisturbed.
"There is the trolls' house," said Erling, shrinking back somewhat.
The level sunlight showed me walls of dull gray chalk, with the marks of the pick on them still.