Smithsonian Magazine is a magnificent timesink. Since the magazine has hundreds, even thousands of archived articles, it’s an easy way to spend a few (dozen) hours learning something from an institution of good repute. Like the museums themselves, the magazine covers a wide variety of topics, from plain-language science articles that even I can understand, to great articles about history and archeology (which is where I always end up). There’s even a section with travel advice! As a venerable institution, the Smithsonian lives up to its reputation, and this online magazine is a great way to experience the best of it.
Plus, it’s free, which is always a plus for me!