Mark Twain,
Roughing It — Chapter LII
(1872)
“ Virginia was a busy city of streets and houses above ground. Under it was another busy city, down in the bowels of the earth, where a great population of men thronged in and out among an intricate maze of tunnels and drifts, flitting hither and thither under a winking sparkle of lights, and over their heads towered a vast web of interlocking timbers that held the walls of the gutted Comstock apart. These timbers were as large as a man's body, and the framework stretched upward so far that no eye could pierce to its top through the closing gloom. ”
