A haven for tropical flora
The Scottish botanical garden consists of 10 greenhouses, varied and contrasting, which showcase the diversity of the planet's warmer climates. When I visited, they were partially closed to decorate for Chinese New Year, but generally they are open daily, and admission is 3 pounds (the rest of the botanical garden is free). Everything inside, the temperature and humidity levels, is controlled by computer, and a vast number of plants thrive here, with extremely rare plants from the island of Soqotra, between Yemen and Somalia. Many of these plants are used for scientific research, and you'll find the largest collection of rhododendrons in the world, as well as orchids, palms and other plants from hot, humid climates.