Four Seasons Hotel Ritz Lisbon

The modernist, 282-room Four Seasons Hotel Ritz Lisboa was built in 1959 as crony housing on dictatorial orders from Prime Minister Salazar. Designed by renowned Portuguese architect Porfirio Pardal Monteiro and built atop one of Lisbon's many hills to maximize city views, this monolithic structure houses Art Deco-meets-Louis XVI interiors embellished by more than 400,000 square feet of Portuguese marble and Norwegian granite. It also houses one of the largest and most important private collections of contemporary art in Portugal. Though you might not need a place to stretch your legs with those extra-spacious rooms (starting at 452 square feet), the open-air rooftop fitness track is a workout wonder.