"Pergola" may not be a term you're familiar with. However, if you're looking for a backyard structure that not only provides shade but also offers hundreds of absolutely beautiful design options, it's one that's definitely worth knowing.
Ipe is also known as Ironwood. It's gorgeous, rot-resistant, pest-resistant, extremely strong and extremely dense. The characteristics that make it long lasting, its strength and density, also make it a tough candidate for holding a finish that will maintain an unweathered look.