Combining stunning architecture with a kaleidoscopic array of plants, greenhouses have been popular since Victorian times. And there’s a wealth of them to be found all over the world. From the towering palms and Brutalist architecture of London’s Barbican Conservatory, to the cloud-like mists and undulating glass rooftop of Singapore’s Gardens by the Bay, here’s our pick of the best. (As always, check the latest COVID-19 advice and restrictions before making any travel plans.)