Royal Botanic Garden Edinburgh (Scotland)
Credit: Jason Friend / Getty Images

An easy commute from Edinburgh's city center, the 70-acre Royal Botanic Garden is known for its rock garden and collection of wild Chinese plants (the largest outside China). Much of their collection species are inside the ten public glasshouses, including one two-story, 400-foot-long behemoth that replicates five climactic zones. Two older glasshouses hold tropical and temperate palms. Come winter, many of the Asian species like Camellias and Daphnes bloom, while outside the trees become a focal point, especially the Vireya rhododendrons.
[rbge.org.uk]