Image: dudley bug
Subterranean bridges might conjure images of Khazad-dûm in the Mines of Moria, where Gandalf faces the Balrog in The Lord of the Rings. Here on middle-of-the-road Earth, however, things are not quite so dramatic. Not quite, but nearly. In the bowels of underground abandoned mines, bridges of timber supported by rusting metal chains cross precipitous, abyssal gaps; yet mine explorers need no second invitation to brave them.