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This just in from the tips jar: Reader Karen Waksman, visiting from Florida, asks for pointers on visitng Google's Mountain View headquarters. I've been to the Googleplex often enough, but never thought of it as a tourist attraction. Waksman is hardly alone, though. "Hugo" on Hereorthere.com got a tour.

Three rules: "No pictures inside the offices and no talk of any secret stuff you see," writes Hugo. Also, don't stick around after your chaperoned visit ends — security will hassle you. Unfortunately for Waksman, who hoped to just drop by, you have to book in advance. Try emailingGoogle PR. And check out our annotated map of the campus.