That photo is from a light display at the Washington National Cathedral that took place this weekend. You can look at other photos on the flickr stream: Cathedral though I have no doubt that photos cannot possibly do justice to seeing the illumination in person.
Here’s some info. on the project:
For three memorable nights in May, Swiss lighting artist Gerry Hofstetter brings his artistry to Washington National Cathedral for a spectacular exterior illumination of the south and west sides, in celebration of the Cathedral’s centennial. Numerous vivid images will be projected directly on the Cathedral sunset to midnight on Friday, Saturday, and Sunday, illustrating its mission of reconciliation, spotlighting its role as a spiritual beacon for the nation, and proclaiming hope for all humankind.