Attempting to test if researchers are able to distinguish between genuine and man-made.

Has an interactive database of formations. Also includes articles. (Macromedia Flash required)

Database of formations dating back to 1590. Articles and other resources. Both Dutch and English.

A feature-length documentary of interviews with leading researchers and scientists.

A rolling news service for the phenomena.

Image library, shop of stock photos and a selection of articles.

Provides views at ground level, using photographs, first hand reports and observations.

Documentary movie. Details about the film makers, links and general information about the phenomena.