It is like trying to describe the indescribable to give any full idea of this the most extensive cavern in the world. Think of a subterranean city 400 feet under the surface, full of monuments, theaters, temples, domes, minarets, and every device of architecture that skill could frame and taste adorn. Imagine the streets extending among towering buildings for a hundred miles. A hush as silent as the tomb prevails. Black, mysterious rivers, full of sightless fish, crawl darkly through the ebon caverns, while the exhala-tions of their silent tide cluster on roof and wall, and garland them with ornaments of cusp and alabaster. It would take too much space to attempt anything like a detail of this extraordinary place At places are narrow chasms that admit the explorer with great difficulty; at other places the way grows wide, and the eyes are greeted with vast domes, from which are suspended huge chandelier-like forms, like purest alabaster; grand chambers that far excel in size and beauty the famed hall of Westminster; while in other places you see facsimiles of great Gothic cathedrals, with their tall clustering shafts, pinnacled altars, exquisitely delicate, as though from the hand of the most cunning artificer. Again you stand trembling on the edge of a chasm over 200 feet in depth, and by means or a torch thrown into the abyss reveal fresh wonders to the beholder; there runs a black river, full of eyeless fish. In another part of the Cave is seen what seems to be a colossal theater - tier rises above tier, till they reach the huge overhanging roof. One lonely passage has been explored clear fifty miles in one direction. One river is nearly a mile across, and in some parts the dripping rock-roof is so low that the passengers in the ferry boat have to bow their heads to pass. In fact, no pen can describe, no pencil portray, the extent, the beauties, the horrors of this dark, mystical subterranean abode - for abode it has been at times. In the part named Audubon's Avenue one sees the shells of several cottages, erected in 1842. It was at that time very generally thought that the equal temperature of the Cave would greatly relieve, if not entirely cure, consumptive patients. The pleasing theory was, however, gainsaid by the result. Many were injured, not benefited by their dwelling in this haunt of Cimmerian blackness.