Fortress Linz-Tower IX (Apollonienturm)

The idea for the Linz Tower Line originated with Archduke Maximilian Joseph of Austria-Este, who, after the experiences of 1809 when Napoleon's advance on Vienna could not be stopped, proposed an imperial fortification system. This envisioned securing strategically important locations with a chain of individual towers that would mutually cover each other and form a far-advanced defensive line. Only the fortification of Linz was realized. In 1828, Maximilian had a test tower built at his own expense on the Freinberg, which successfully withstood demolition and shelling tests despite adverse conditions.