Rome's great green lung: Villa Borghese — the Asclepius temple lake ringed by rowboats, the Pincio terrace over Piazza del Popolo and the city's domes, and the Borghese Gallery holding Bernini's greatest marbles (Apollo and Daphne, implausible in stone). The gallery books mandatory two-hour slots — among Rome's most precious reservations: book it first of all; Pincio sunset over the domes closes the classic afternoon; bikes and pedal carts rent for sweeping the wide park.