It was begun in 1475 as one of the Old Town's thirteen gates, beside the Royal Court, but was left unfinished when the king moved to the Castle. In the 17th century it stored gunpowder, hence its name, and Josef Mocker gave it its present Gothic Revival look in the 19th.
This was the start of the Royal Route, the coronation procession that crossed the Old Town and Charles Bridge to the Castle. You climb 186 steps to a gallery overlooking the rooftops.
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Checked on November 5, 2026.
Sources: Wikidata · OpenStreetMap · Google Maps (Place ID) · Muzeum hlavního města Prahy