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From Project Gutenberg e-text #70652 (public domain in the USA).
Would to Heaven we had never approached them at all, but had run back at top speed out of that blasphemous tunnel with the greasily smooth floors and the degenerate murals aping and mocking the things they had superseded--run back, before we had seen what we did see, and before our minds were burned with something which will never let us breathe easily again!
What we did see--for the mists were indeed all too malignly thinned--was something altogether different, and immeasurably more hideous and detestable. It was the utter, objective embodiment of the fantastic novelist's 'thing that should not be'; and its nearest comprehensible analogue is a vast, onrushing subway train as one sees it from a station platform--the great black front looming colossally out of infinite subterraneous distance, constellated with strangely colored lights and filling the prodigious burrow.
From Project Gutenberg e-text #50133 (public domain in the USA).
Two centuries ago, when talk of witch-blood, Satan-worship, and strange forest presences was not laughed at, it was the custom to give reasons for avoiding the locality.