Pergolas / Porticos / Gazebos
A pergola is a garden feature forming a shaded walk or passageway of pillars that support cross beams and a sturdy open lattice, upon which woody vines are trained. Benches can be put under the pergola for seating in the shade.
A portico is a porch leading to the entrance of a building, with a roof structure over a walkway supported by columns. Sometimes this structure is enclosed, but usually it is open for good viewing. It lends itself to thoughts of the Roman Empire.
A gazebo is a pavillion structure, often octoganal, that provides shade, ornamental features, basic shelter, and a place to rest. Gazebos are freestanding, roofed, and open on all sides. Sometimes they are attached to a wall or porch. Gazebos are usually placed in a well tended area where there are flowers and ornamental trees for the enjoyment of the onlooker.