Barbican

Kraków's Barbican is the largest surviving barbican in Europe — a hulking Gothic brick outwork erected in 1498–99 on the orders of King John I Albert to defend the Florian Gate against Ottoman and Tatar raids that, as it turned out, never materialised. The structure features seven projecting turrets and walls nearly four metres thick, connected to the Florian Gate by a now-partially reconstructed neck passage. In the 18th century Austrian authorities planned to demolish it; only a concerted civic campaign by local intellectuals preserved the building. Run today by the Muzeum Krakowa, the interior opens as an exhibition space from 10:30 to 18:00 daily between April and October. Visitors can examine the original brick fabric, loopholes, and the layout of the defensive corridor that once linked it to the city walls.