This chapter examines the remarkable growth in the popularity of mountain climbing in Britain during the Romantic period, as adventurous fell-walkers went in search of the sublime. Mountain summits were increasingly seen as the ultimate sublime location and ascent as a near-guaranteed way to experience psychological as well as physical elevation. The chapter explores the links between mountains and the sublime in the period’s aesthetic theories before examining how the literature of British domestic tourism described the sublime pleasures of ascents to British summits. It investigates the relationship between the presentation of sublime experiences on British mountains and those on the higher peaks of the Alps and traces the emergence of Snowdon in Wales, Skiddaw in the Lake District, and Ben Lomond in Scotland as pre-eminent British sublime locations. It shows how, as summits became more crowded, thrill-seeking climbers increasingly ventured to more remote and dangerous locations to experience the sublime.