Welcome to Wikimedia Commons. This site takes a little practice to learn to navigate and find an image that you might be looking for, but they do offer several thousand quality photos taken around the world. Licences vary, but most just require that you attribute the photo to the person who took the photo and uploaded it to Wikimedia. You can sort search results by country, state, topic, author, nature, science,earth, space, animals, etc, etc.
This is a photo of the terminal at Dulles airport in Sterling VA, most likely taken from the upper levels of a parking garage. If I needed a photo of Dulles, I wouldn't mind giving Joe Ravi attribution for this photo if I needed a photo like this on my blog or web site. It would take me at least 2-3 hours to take a photo like this myself, even though I have driven through that terminal hundreds of times.
Start at Wikimedia.org, then scroll down to the Wikimedia Commons tab if you're interested in checking out this source.
"When using this image under the Creative Commons Share-Alike License please attribute this image to the author, Joe Ravi, and include the acronym of the license CC-BY-SA 3.0 in a prominent location near the image."
Contact Jeff Pearl if you are considering buying or selling Dulles VA area homes or land.
Jeff Pearl / REALTOR / Lic in VA
RE/MAX Distinctive - Reston VA
Homes / Land / Farms
Equal Housing Opportunity Provider