In an effort to make your work week a little less blah, we thought it would be fun to test-run a new contest on the Buzz blog.

Once a week, we will post a photo and ask you to identify the Washington area locale where it was taken.

The mystery locations will be intentionally tough to identify, but not to worry — we will give you some time to mull the photos over before updating the posts every 15 minutes or so with clues. (The clues will be based on recent articles on PostLocal, so go nuts using the search bar on the top right corner of this page.)

Leave your guesses in the comments below. Come back at 2:45 p.m., 3 p.m. and 3:15 p.m. to get your clues. We’ll announce a winner — and the correct answer — once someone guesses correctly.

Updated at 2:45 p.m. — CLUE 1: A local story from May 17 mentions the length of the Purple line. How many miles long would it be?

Updated at 3 p.m. — CLUE 2: A local story from May 17 about the Metrorail extension to Dulles quotes the chairman of a local Board of Supervisors. What is his middle initial?

Updated at 3:15 p.m. — CLUE 3 (final clue!): Mike DeBonis recently wrote on his blog that Mayor Gray planned to attend a grand opening in which quadrant of the city?

Updated at 3:40 p.m. — WINNER: Commenter SBaltzer guesses the right answer at 3:15! It’s 16th and K Streets, NW.

This photo was taken at a busy D.C. intersection. Which one is it? (We’re looking for the two cross-streets and the quadrant.)

At what D.C. intersection was this photo taken? Leave your guesses in the comments below. (By Andrea Caumont/The Washington Post)