A dozen nations vie for the title of real-life Shangri-La, but Bhutan’s claim has more clout than most. This tiny piece of Himalayan paradise operates a strict ‘high-value, low-impact’ tourism policy, compelling travellers to pay a high daily fee just to set foot in its pine-scented, monastery-crowned hills. The pay-off for visitors is a chance to walk along mountain trails unsullied by litter, in the company of people whose Buddhist beliefs put them uniquely in tune with their environment. Bhutan punches well above its weight when it comes to sustainability. It is already the world’s only carbon-negative country, and the kingdom is set to become the first fully organic nation by 2020, so it’s only going to get more beautiful. And with the daily fee, it won’t be getting any more crowded.