Vaxholm

This guide to Vaxholm fortress near Stockholm follows engineer Carl Fredrik Meijer through thirty years spent rebuilding its granite walls into one of the most ambitious defenses in the region. You'll hear about the 1872 test firing that put those walls to an unexpected test, and the Prussian field marshal who had something to say about the result. It traces how the fortress carried on afterward, first as a prison and later as the museum you can walk through today.