contest currently running (through the end of September) to find the best new photograph of a historical site/building added to their collection.
In the US that means finding a site on the National Register of Historic Places in your state (they even have it broken down by counties - mine, for example), then heading out to take a photo. Yeah, if you're hoping to win the contest (and one of the prizes), you're probably going to need a good camera, great weather, and an eye for photography. If you just want to help them take photos of historic sites before those historic sites go away, however, head out tomorrow and take a few snapshots.
The wikiwhatever foundation is really doing some phenomenal work documenting our world, and this is another example. Help 'em out, would ya?