The part of Basel that lies roughly between the river and the old city gate at Spalentor is not large but quite atmospheric with its stone streets, medieval churches, beautifully maintained old homes, and brightly painted fountains. But leave it to Basel to introduce a thoroughly modern and whimsical fountain by Swiss sculptor Jean Tinguely in the midst of the stately historic houses. Filling a pool in Theaterplatz is a series of playful and ingenious water-spouting contraptions made of scrap metal. In winter, these freeze into fantastic ice sculptures.From Marktplatz, wander west along Spalenberg with detours into some of the narrow side streets, such as Leonhardsberg and Spalenberg, Heuberg. This was the old artisans' neighborhood. Or wander along Freiestrasse, which begins with the Renaissance Geltenzunfthaus, from 1578. At number 25 is the guild-house of the locksmiths dating from 1488 and decorated in Baroque style in 1733.