Central Park in New York City has a gorgous pergola.

Here is one link (sorry about the ads with it).

Here is another (in this instance, with a watermark in the center, but you can load various sizes to get a really good look at it).

There are more here in this Google search.

I'd love to have a pergola, but I'll probably have to settle for a brush arbor. They're indigenous to the area and I could more easily build it myself.

SRS