Have you seen the zodiacal light? It's surprisingly easy if you can find a dark location with an unobstructed horizon to the west (for evening viewing) or east (in the morning).The key is picking a clear, moonless night at the proper time of year. At mid-northern latitudes the evening zodiacal light shows best from late January through early April, and the morning zodiacal light shows best from September through November.
Taking the Moon into account, the windows for evening viewing in 2013 are roughly:
January 29 - February 10
February 27 - March 12
March 29 - April 12
You might be able to see the zodiacal light one evening before these periods start, at the cost of having your session cut short as the just-past-full Moon rises. And you might stretch these one evening longer if you're willing to wait until the thin crescent Moon has set.
Go out in evening twilight and look to the west. As the Sun's glow fades, it will also change shape. The bright glow along the horizon will disappear, leaving a huge, tall pyramid of diffuse light leaning slightly to the left along the line of the ecliptic. That's the zodiacal light — it's a lovely sight.
See the article Have You Seen the Zodiacal Light? for more information on observing the zodiacal light. And also see Zodiacal Light's Mystery Solved for the latest — and rather surprising — theories of the zodiacal light's origin.