All throughout the old town are traboules, covered passageways that date back to the 4th century. Whether you’re trying to stroll by way of the countryside, sip Champagne, or soak up some sun on the seaside, these are one of the best day trips underneath two hours from Paris. Each of the properties chosen by our readers as the city’s best occupies either a highrise or part of a skyscraper, and all of them afford staggering views of the metropolis. The Conrad Tokyo (No. 4), for instance, spans ten floors of the Tokyo Shiodome Building, which soars above the Minato…