Some passages from Thomas de Quincey’s Confessions of an English Opium-Eater.  I think vertiginous is one of the most abused back-cover descriptors but it fits de Quincey’s architectural nightmares too well not to use it.

Some of these rambles [through London] led me to great distances, for an opium-eater is too happy to observe the motion of time; and sometimes in my attempts to steer homewards, upon nautical principles, by fixing my eye on the pole-star, and seeking ambitiously for a north-west passage, instead of circumnavigating all the capes and head-lands I had doubled in my outward voyage, I came suddenly upon such knotty problems of alleys, such enigmatical entries, and such sphynx’s riddles of streets without thoroughfares, as must, I conceive, baffle the audacity of porters and confound the intellects of hackney-coachmen.  I could almost have believed at times that I must be the first discoverer of some of these terræ incognitæ, and doubted whether they had yet been laid down in the modern charts of London.  For all this, however, I paid a heavy price in distant years, when the human face tyrannised over my dreams, and the perplexities of my steps in London came back and haunted my sleep, with the feeling of perplexities, moral and intellectual, that brought confusion to the reason, or anguish and remorse to the conscience

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comprehend the unimaginable horror which these dreams of Oriental imagery and mythological tortures impressed upon me.  Under the connecting feeling of tropical heat and vertical sunlights I brought together all creatures, birds, beasts, reptiles, all trees and plants, usages and appearances, that are found in all tropical regions, and assembled them together in China or Indostan.  From kindred feelings, I soon brought Egypt and all her gods under the same law.  I was stared at, hooted at, grinned at, chattered at, by monkeys, by parroquets, by cockatoos.  I ran into pagodas, and was fixed for centuries at the summit or in secret rooms: I was the idol; I was the priest; I was worshipped; I was sacrificed.  I fled from the wrath of Brama through all the forests of Asia: Vishnu hated me: Seeva laid wait for me.  I came suddenly upon Isis and Osiris: I had done a deed, they said, which the ibis and the crocodile trembled at.  I was buried for a thousand years in stone coffins, with mummies and sphynxes, in narrow chambers at the heart of eternal pyramids.  I was kissed, with cancerous kisses, by crocodiles; and laid, confounded with all unutterable slimy things, amongst reeds and Nilotic mud.

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Many years ago, when I was looking over Piranesi’s, Antiquities of Rome, Mr. Coleridge, who was standing by, described to me a set of plates by that artist, called his Dreams, and which record the scenery of his own visions during the delirium of a fever. Some of them (I describe only from memory of Mr. Coleridge’s account) represented vast Gothic halls, on the floor of which stood all sorts of engines and machinery, wheels, cables, pulleys, levers, catapults, &c. &c., expressive of enormous power put forth and resistance overcome. Creeping along the sides of the walls you perceived a staircase; and upon it, groping his way upwards, was Piranesi himself: follow the stairs a little further and you perceive it come to a sudden and abrupt termination without any balustrade, and allowing no step onwards to him who had reached the extremity except into the depths below. Whatever is to become of poor Piranesi, you suppose at least that his labours must in some way terminate here. But raise your eyes, and behold a second flight of stairs still higher, on which again Piranesi is perceived, but this time standing on the very brink of the abyss. Again elevate your eye, and a still more aërial flight of stairs is beheld, and again is poor Piranesi busy on his aspiring labours; and so on, until the unfinished stairs and Piranesi both are lost in the upper gloom of the hall. With the same power of endless growth and self-reproduction did my architecture proceed in dreams. In the early stage of my malady the splendours of my dreams were indeed chiefly architectural; and I beheld such pomp of cities and palaces as was never yet beheld by the waking eye unless in the clouds. From a great modern poet I cite part of a passage which describes, as an appearance actually beheld in the clouds, what in many of its circumstances I saw frequently in sleep:

The appearance, instantaneously disclosed,
Was of a mighty city—boldly say
A wilderness of building, sinking far
And self-withdrawn into a wondrous depth,
Far sinking into splendour—without end!
Fabric it seem’d of diamond, and of gold,
With alabaster domes, and silver spires,
And blazing terrace upon terrace, high
Uplifted; here, serene pavilions bright
In avenues disposed; there towers begirt
With battlements that on their restless fronts
Bore stars—illumination of all gems!
By earthly nature had the effect been wrought
Upon the dark materials of the storm
Now pacified; on them, and on the coves,
And mountain-steeps and summits, whereunto
The vapours had receded,—taking there
Their station under a cerulean sky. &c. &c.

The lines are from Wordsworth’s Excursion

From Thomas de Quincey’s Confesions of an English Opium-Eater:

….but another person there was at that time whom I have since sought to trace with far deeper earnestness, and with far deeper sorrow at my failure.  This person was a young woman, and one of that unhappy class who subsist upon the wages of prostitution.  I feel no shame, nor have any reason to feel it, in avowing that I was then on familiar and friendly terms with many women in that unfortunate condition.  The reader needs neither smile at this avowal nor frown; for, not to remind my classical readers of the old Latin proverb, “Sine cerere,” &c., it may well be supposed that in the existing state of my purse my connection with such women could not have been an impure one.  But the truth is, that at no time of my life have I been a person to hold myself polluted by the touch or approach of any creature that wore a human shape; on the contrary, from my very earliest youth it has been my pride to converse familiarly, more Socratio, with all human beings, man, woman, and child, that chance might fling in my way; a practice which is friendly to the knowledge of human nature, to good feelings, and to that frankness of address which becomes a man who would be thought a philosopher.  For a philosopher should not see with the eyes of the poor limitary creature calling himself a man of the world, and filled with narrow and self-regarding prejudices of birth and education, but should look upon himself as a catholic creature, and as standing in equal relation to high and low, to educated and uneducated, to the guilty and the innocent.  Being myself at that time of necessity a peripatetic, or a walker of the streets, I naturally fell in more frequently with those female peripatetics who are technically called street-walkers.