Some Richmond memorials, however, antedate the Civil War. Its "first house"--a low, steep-roofed stone cabin on the Main street, said to have been there when the town site was first laid out--is an object of homage. The popular idea is that the Indian King Powhatan originally lived in this house, but it was probably constructed after his time. Not far away, upon Richmond or Church Hill, stands St. John's Church among the old gravestones in a spacious churchyard. It was built in 1740--a little wooden church with a small steeple. Here the first Virginian Convention was held which paved the way for the Revolution in 1775, and listened to Patrick Henry's impassioned speech--"Give me liberty or give me death." The pew in which he stood while speaking is still preserved. An adjoining eminence is called Libby Hill, where lived Luther Libby, who owned most of the land thereabout. Under its shadow was the Libby Prison of the Civil War, since removed to Chicago for exhibition. It had been a tobacco warehouse, occupied by Libby & Co., but during the war it held at various times over fifty thousand Northern prisoners. All the captured soldiers were first taken to Libby, the commissioned officers remaining there, while the privates were sent to points in the interior. The most noted event in the history of this prison was the boring of a tunnel through the eastern wall, in February, 1864, by which one hundred and nine prisoners, led by Colonel Streight, managed to escape into an adjoining stable and storehouse, and though more than half of them were recaptured, the others got safely out of Richmond and into the Union lines. The water power of the James River supplies huge flour mills and other factories, and alongside the stream are the extensive Tredegar Iron Works at the base of Gamble Hill, one of the largest iron and steel works in the Southern States. Here were made the Confederate cannon, shot and shell, and the primitive armor plates for their few warships. This hill also overlooks the James River and Kanawha Canal, an interior water way going westward beyond the Alleghenies. In mid-river above is Belle Isle, a broad, flat island, which during the war was a place of imprisonment for private soldiers, but upon it is now an iron mill. Along the lower river are the wharves and shipping, in the section called Rocketts, and here are also the tobacco storehouses and factories, the chief Richmond industry, for it is the world's leading tobacco mart, receiving and distributing most of the product of the rich soils of Virginia, Kentucky and Carolina. The pungent odor generally pervades the town, for whichever way the wind may blow it wafts the perfume of a tobacco or cigarette factory. The Tobacco Exchange is the business centre, and this industry is of the first importance. The modern-built City Hall, adjacent to the Capitol Park, is one of Richmond's finest buildings.