Which descriptive details of the interior of the house suggest that the narrator has has entered a realm that is very different from the ordinary world?

From the text:

".... I entered the Gothic archway of the hall."

"While the objects around me --while the carvings of the ceilings, the sombre tapestries of the walls, the ebon blackness of the floors, and the phantasmagoric armorial trophies which rattled as I strode, were but matters to which, or to such as which, I had been accustomed from my infancy --while I hesitated not to acknowledge how familiar was all this --I still wondered to find how unfamiliar were the fancies which ordinary images were stirring up. On one of the staircases, I met the physician of the family. His countenance, I thought, wore a mingled expression of low cunning and perplexity."

The windows were long, narrow, and pointed, and at so vast a distance from the black oaken floor as to be altogether inaccessible from within.

Dark draperies hung upon the walls. The general furniture was profuse, comfortless, antique, and tattered. Many books and musical instruments lay scattered about, but failed to give any vitality to the scene. I felt that I breathed an atmosphere of sorrow. An air of stern, deep, and irredeemable gloom hung over and pervaded all.