High-speed rail between each, boutique stays in the heart of every city, and local guides for what makes each one unique.
Louvre, Marais, and the Seine by dusk.
Canals, museums, and a bike ride through Jordaan.
Grand Place, chocolatiers, and a taste of Flemish art.
Castle, Charles Bridge, and bohemian Vinohrady.
Coffeehouses, concerts, and Schönbrunn.
Forum, Vatican, and a Trastevere dinner to close.