3) Kew Royal Botanic Gardens.
Kew Gardens in London, England, is one of the brightest gems in the horticultural crown of the UK. It is also one of the most historically and botanically significant due to its large collection and stunning Victorian glasshouses.
This adds a different edge to the beauty of Kew, taking visitors away from impressive 3.6 hectares of outdoor gardens and into a tropical paradise. The Palm House has that old-fashioned charm, but the walkway of the modern Princess Wales greenhouse adds another dimension.