Cathédrale Notre-Dame
The interior presents a stark contrast to the facade: it's older (mostly finished by 1275), and the nave's broad windows emphasize the horizontal rather than the vertical. Note Hans Hammer's ornately sculpted pulpit (1485) and the richly painted 14th- to 15th-century organ loft that rises from pillar to ceiling. The left side of the nave is flanked with richly colored Gothic windows honoring the early leaders of the Holy Roman Empire—Otto I and II and Heinrich I and II. The choir is not ablaze with stained glass but framed by chunky Romanesque masonry. Head to the right transept to admire the Pilier des Anges (Angels' Pillar), an intricate Gothic column dating from around 1230.
\nJust behind the pillar, the Renaissance machinery of the imposing 16th-century Horloge Astronomique whirs into action daily at 12:30 pm (but the line starts at the south door at 11:45 am) with macabre clockwork figures enacting the story of Christ's Passion. One of the highlights: when the apostles walk past, a likeness of Christ as a rooster crows three times.