Kew

Kew Botanical Garden's Treetop Walkway literally lets you amble through the trees. The path leads underground first, to the Rhizotron, where an installation teaches you about tree roots. Then, you'll head 59 feet up to walk amongst the lime, sweet chestnut, and oak trees and mingle with the resident birds and bees. It's a very special experience for adults and kids alike. During the holidays, they do up the entire place in lights and guide after-dark tours along the path as well.