Kew is London's largest UNESCO World Heritage site offering unique landscapes and iconic architecture from every stage of the Gardens' history. Its collection of living plants is the largest and most diverse in the world, growing out in the gardens and inside the stunning glasshouses. Experience the Treetop Walkway, the most compelling tree-top experience in the UK. It takes you under the ground and then 59 feet up in the air, bringing you close to trees that will take your breath away. The 17th-century Queen's Garden behind Kew Palace are guaranteed to restore flagging spirits, as the plants you'll find here were mainly cultivated for their medicinal properties. Take a stroll around and discover many herbal varieties that people still use to this day. Explore tropical rainforests inside the Palm House and marvel at the architecture of the newly restored Temperate House, home to some of the rarest and most threatened plants in the world. Discover theBamboo Garden, home to the UK's largest collection of bamboos, which range from the well-known lofty pole varieties to wispy, variegated species.