Pisa's Piazza dei Miracoli gets 10 million visitors a year, and 9 million of them do the same thing: take a photo pretending to hold up the tower, spend €18 on a miniature tower souvenir, and leave. The 1 million who do it RIGHT: climb the tower (€20, pre-booked — 294 steps spiraling at a 4° tilt that makes your inner ear disagree with your legs), enter the Cathedral (free — Cimabue's apse mosaic, Giovanni Pisano's pulpit), and hear the Baptistery acoustics (a guard demonstrates the echo every 30 min — the dome produces a chord from a single note). 30 min from Florence by train.
The Tower: €20, pre-book on opapisa.it (sells out 2+ weeks ahead in summer). 294 steps, 30 min slot. The tilt (3.97°) is FELT — walking up the spiral, one side pushes you into the wall, the other side pulls you toward the void. The Cathedral (Duomo): Free (timed entry via opapisa.it). Romanesque-Pisan style (1064). Cimabue's Christ mosaic in the apse (1302 — survived a 1595 fire). Giovanni Pisano's pulpit (1302-10 — 9 relief panels, the most dramatic Gothic pulpit in Italy). The Baptistery: €7 or combo. Every 30 min a guard stands in the center and sings a note — the dome transforms it into a CHORD (natural resonance amplifies harmonics). 30 seconds of acoustic magic.
Practical: €27 combo (Tower + Cathedral + Baptistery + Camposanto + Sinopie Museum). From Florence: 1h train (€9). Day trip strategy: 9am train → Tower 10am → Cathedral → Baptistery → lunch at Il Montino (cecina flatbread, €3) → 1pm train back to Florence.