For romance, Wallenstein Garden delivers.
A genuinely surprising, free oasis steps from the castle hill — formal parterres, roaming peacocks, an eerie stalactite grotto wall and bronze statuary, all hushed. The catch: it's seasonal and keeps government hours, the bronzes are replicas (originals were looted to Sweden), and it's tucked behind an easily-missed gate. One of the best free things in Prague.