Site crawl and xml sitemap via drupal

Hello,

When I ask search engines to crawl my site, they totally miss the gallery. I tried altering my sitemap, but the XML sitemap built by Drupal misses all of the gallery pages because they are not a part of the site's natural hierarchy.

I would like to know how to make it so that Google, for example, recognizes all the wonderful pages of my gallery, and so that Drupal's XML sitemap includes all the gallery pages/nodes/what-have-you.

Thanks.

http://sierrawildflowers.newbott.net