I once read a short story collection, possibly in the 1980s. It was a mass market paperback if I recall correctly. The story that stood out for me was an interstellar exploratory party landing on a "golden planet" (could be wrong). The planet is populated by completely harmless flora and fauna.
They find a structure that they decipher to be a museum of a superior race(?). I believe this story was also the cover illustration. I want to say that they find a habitat for humankind in the structure, but I don't remember. Sorry. I almost thought the title of the story was "Au". Sorry.
What is the title of this book?