Built into the northern wall of Prague Castle, these 16th-century miniature houses are assigned by legend to Emperor Rudolf II's royal alchemists (Athanor Laboratories) — the archives record castle marksmen and goldsmiths, but the lane has kept its golden name for four centuries, and Prague has always trusted its legends over its ledgers. House No. 22 sheltered Franz Kafka through the winter of 1916; No. 15 is shown with the furnace crucibles of the transmuters' craft (Aurum Potabile).
The full decipherment and its observational protocol — where to stand, when, and what to watch for — are in the Prague field codex.
Or read the complete Florence codex free first.