Gloom.

All the stories of ghosts and goblins that he had heard in the afternoon now came crowding upon his recollection. The night grew darker and darker; the stars seemed to sink deeper in the sky, and driving clouds occasionally hid them from his sight. He had never felt so lonely and dismal. He was, moreover, approaching the very place where many of the scenes of the ghost stories had been laid. In the centre of the road stood an enormous tulip-tree, which towered like a giant above all the other trees of the neighborhood, and formed a kind of landmark. Its limbs were gnarled and fantastic, large enough to form trunks for ordinary trees, twisting down almost to the earth, and rising again into the air. It was connected with the tragical story of the unfortunate André, who had been taken prisoner hard by; and was universally known by the name of Major André's tree. The common people regarded it with a mixture of respect and superstition, partly out of sympathy for the fate of its ill-starred namesake, and partly from the tales of strange sights, and doleful lamentations, told concerning it.

As Ichabod approached this fearful tree, he began to whistle; he thought his whistle was answered; it was but a blast sweeping sharply through the dry branches. As he approached a little nearer, he thought he saw something white, hanging in the midst of the tree: he paused and ceased whistling but, on looking more narrowly, perceived that it was a place where the tree had been scathed by lightning, and the white wood laid bare. Suddenly he heard a groan—his teeth chattered, and his knees smote against the saddle: it was but the rubbing of one huge bough upon another, as they were swayed about by the breeze. He passed the tree in safety, but new perils lay before him. 

About two hundred yards from the tree, a small brook crossed the road, and ran into a marshy and thickly-wooded glen, known by the name of Wiley's Swamp. A few rough logs, laid side by side, served for a bridge over this stream. On that side of the road where the brook entered the wood, a group of oaks and chestnuts, matted thick with wild grapevines, threw a cavernous gloom over it. To pass this bridge was the severest trial. It was at this identical spot that the unfortunate André was captured, and under the covert of those chestnuts and vines were the sturdy yeomen concealed who surprised him. This has ever since been considered a haunted stream, and fearful are the feelings of the schoolboy who has to pass it alone after dark.

As he approached the stream, his heart began to thump; he summoned up, however, all his resolution, gave his horse half a score of kicks in the ribs, and attempted to dash briskly across the bridge; but instead of starting forward, the perverse old animal made a lateral movement, and ran broadside against the fence. Ichabod, whose fears increased with the delay, jerked the reins on the other side, and kicked lustily with the contrary foot: it was all in vain; his steed started, it is true, but it was only to plunge to the opposite side of the road into a thicket of brambles and alder bushes. The schoolmaster now bestowed both whip and heel upon the starveling ribs of old Gunpowder, who dashed forward, snuffling and snorting, but came to a stand just by the bridge, with a suddenness that had nearly sent his rider sprawling over his head. Just at this moment a plashy tramp by the side of the bridge caught the sensitive ear of Ichabod. In the dark shadow of the grove, on the margin of the brook, he beheld something huge, misshapen and towering. It stirred not, but seemed gathered up in the gloom, like some gigantic monster ready to spring upon the traveller.

Washington Irving, from "The Legend of Sleepy Hollow"