Although Hall has somewhat declined as a commercial centre with the rise of its big neighbour, Innsbruck, it is still a place of considerable activity on account, chiefly, of the famous salt mines. In former times these and its position on the banks of the Inn (then much more navigable) gave the place importance under the rule of the Counts of Tyrol, and the earlier of the Austrian princes; many barges and boats from the Danube itself in former times making their way into the Inn and thence to the flourishing town of Hall. The salt works still remain its principal industry. Hall is, as things go in Tyrol, a distinctly smoky town; but it is seldom that the smoke hangs in the clear and fresh Alpine air which sweeps along the Inn valley down from the environing hills. The Münsterturm, mint tower, which, as we have said, is so prominent an object on approaching the town, is of historical interest from the fact that it was built to enable Duke Sigismund, known as the Rich, to turn into coin his great store of silver taken from the Tyrol mountains. It was from this tower, too, that Andreas Hofer issued his Kreuzer and twenty Kreuzer pieces during the period of his brief dictatorship. As was the case with many another Tyrolean town, Hall suffered in the past from the calamities which afflicted so many similar places in the Middle Ages. It was swept in turn by fire, sword, and pestilence, and shaken to its foundations by the earthquake which occurred in 1670. So severe was the shock, we are told, that the watchman on the parapet of the church tower was thrown off and killed by falling to the ground, and the people fled out of their houses to the open fields where their priests exhorted them to prepare for the Day of Judgment. That the alarm created was very great is borne out by the fact that, although the loss of life would appear from contemporary sources of information to have been slight, for some time afterwards the services of the church were all performed in the open air. Hall, however, chiefly on account of its salt mine resources, recovered, and these and the many privileges the burghers enjoyed enabled them in time to regain their former prosperity.