As urban living intensifies in density and numbers, the city landscape expands both outwards and upwards. Architects and urban designers craft new and experimental structures while also investigating existing buildings for potential reinvention or expansion. In particular, the roof of a building, once a perfunctory structural element, is now a city space in and of itself, beloved for the capacity to eke out further room for living or to craft inspiring refuges away from the bustle of the metropolis.This international selection of urban rooftops catalogues a new urban dimension. Through over 50 bars, restaurants, temporary art installations, and gardens, it testifies to the variety of intelligent and exuberant designs that grace city summits from Sydney to Hong Kong, Oslo to Chicago.