Wood Gazebo is a GOTO gathering place for friends and family offering protection from the sun and rain!
Today, with the introduction of aluminum tubing and sheet roofing one can install a metal gazebo in your backyard at a fraction of the cost of a wood gazebo! 
Here is an example of a large 6 sided Gazebo design using wood posts, roof timbers, wood railing and roof decking with asphalt roof shingles.
If your Gazebo Deck is low to the grade, then banisters could be optional!
Palm Trees around always a tropical vibe!
Tiki Shelter built on 6 solid wood posts.
Close up of palm roof finish.
Inside the Tiki Shelter showing a well design roof structure. 
Close up of design finish between each wood post.
Close up photo of the wood capping design for the roof top.
Nice Teak wood curved back benches
Asian Design uses a clay shaped vessel upside down to cap the top.
Welded steel structure and metal roofing provide strength and protection. 
A lot of Gazebo fancy design is in the top. This one allows hot air captured in the peak to vent out
