#1
Rome
The Eternal City has quietly become one of Europe's better-walkable capitals — Trastevere, Monti and the centro storico are entirely doable on foot, the metro and tram cover the rest, and the Villa Borghese and Appian Way regional park give the city a vast green lung. Most boutique hotels in Monti and Trastevere now carry Legambiente Turismo or Ecolabel UE marks, with rooftop solar increasingly standard.
Highlights: Colosseum & Roman Forum · Vatican Museums & Sistine Chapel · Trastevere by night · Villa Borghese gardens