Pergola is an outdoor garden feature forming a shaded
walkway, passageway, or sitting area of vertical posts or pillars that usually
support cross-beams and a sturdy open lattice, often upon which woody vines are
trained. The origin of the word is the Late Latin pergola,
referring to a projecting eave. As a type of gazebo, it may also be an
extension of a building or serve as protection for an open terrace or a link
between pavilions. They are different from green tunnels, with a green tunnel
being a type of road under a canopy of trees.