From a Post on the Wikimedia Blog:
On December 4, 2012, Wikimedia Commons, the free media repository, hit the 15 million media file milestone. The 15 millionth picture depicts Tropical Depression Seventeen-W, a tropical cyclone that developed during the 1996 Pacific typhoon season, and was created by the United States National Oceanic and Atmospheric Administration.
599 days had passed since the last milestone of 10 million media files, which was reached on April 15 2011. Credit is due to the Wikimedia Commons community, who is largely involved in a variety of projects, processes and negotiations that are intended to improve the availability of public domain and freely-licensed educational media content to the public.
The last two years have seen an increasing number of cultural institutions (GLAM) and other organisations providing content that would have otherwise not been freely accessible.
Direct to Wikimedia Commons
Browse the Latest Files Added to Wikimedia Commons
Read the Complete Blog Post