Paris's oldest church was built to shelter a simple shard of wood, said to be a relic of Jesus's cross brought back from Spain in AD 542. Vikings came down the Seine and sacked the sanctuary, and Revolutionaries used it to store gunpowder. Yet the elegant building has defied history's abuses: its 11th-century Romanesque tower continues to be the central symbol of the neighborhood. The colorful 19th-century frescoes in the nave are by Hippolyte Flandrin, a pupil of the
classical master Ingres; and the Saint Benoit chapel contains the tomb of philosopher René Descartes. Step inside for spiritual nourishment, or pause in the square to people-watch—there's usually a street musician tucked against the church wall, out of the wind. The church stages superb organ concerts and recitals. See the website for details.
Pl. St-Germain-des-Prés, Paris, 75006, France