On Tuesday, we featured the 121st challenge to see how well you know the Metro system. Here are the answers.

This week, we got 16 guesses. Seven got all five right. Great work, Kevin M, Patrick B, Peter K, Transport., AlexC, Solomon, and Stephen C!

Image 1: Metro Center

The first image shows the redecorated Metro Sales Office in the 12th and F mezzanine at Metro Center. The kiosk was redecorated for its new co-role as the Metro Store. After taking this picture, I bought a Metro map coffee mug, and you should stop by to check out the merchandise if you haven't yet.

Other clues included the crossvault visible in the distance, indicating that this is one of the downtown transfer stations. The arrangement of the pointed coffers at the crossvault means this has to be Metro Center. At L'Enfant, they don't extend all the way to the center of the vault and at Gallery Place, there's a mezzanine under the crossvault.

Fourteen of you knew this one.

Image 2: Friendship Heights

This one proved to be trickier than expected. Friendship Heights is the correct answer, but Bethesda was also a plausible guess. I was a little too aggressive with the crop at the bottom, but with a keen eye, you should have been able to deduce that this was Friendship Heights and not Bethesda, but the similarities are strong here.

There are only two underground stations with Metro's globe lights on platform pylons: Friendship Heights and Bethesda. However, Bethesda has exactly two globe lights on one pylon. At Friendship Heights, every pylon that isn't under a mezzanine has a pair of these. This particular pylon just north of the southern mezzanine at Friendship Heights has the globes arranged just like the one at Bethesda does. But there is a key difference.

At Bethesda, the pylon that has the globe lights also has two sodium vapor lights on the two sides of the pylon facing the escalators. That would give the leading edge of the mezzanine a very distinctive yellow-orange tint, which is absent here, since Friendship Heights doesn't have those lights.

Seven of you guessed correctly. Four others guessed Bethesda.

Image 3: Crystal City

The third image shows the bus bays at Crystal City station. The bus stops at this station are located along South Bell Street underneath an office building. If you look closely at top right, you can see a portion of a green ART bus stop flag, which should have helped you narrow this down to a stop in Arlington.

Thirteen of you got this one right.

Image 4: McLean

The fourth image shows a view looking north from aboard a Wiehle-bound Silver Line train at McLean. This is the new Capital One building under construction. The concrete side panels of the trackway at the bottom of the image are typical of those used on the Silver Line, and this was a clue. The arrangement of the street below should have also helped you figure this one out, along with the position of the Tysons skyline.

Twelve of you guessed McLean.

Image 5: Rosslyn

The final image shows the Fort Meyer Drive entrance to Rosslyn. This station actually has several low-key entrances, and this one feels very much like a back door to the station. I specifically cropped it so that you could see three color bars on the pylon, because I worried that without that, the difficulty would be too great. Several of you mentioned using the Cushman Wakefield banner in the background as a way to narrow this down to Virginia.

Twelve of you came to the correct conclusion.

Great work, everyone. Thanks for playing! We'll be back soon with challenge #120.

Information about contest rules, submission guidelines, and a leaderboard is available at http://ggwash.org/whichwmata.

Matt Johnson has lived in the Washington area since 2007. He has a Master’s in Planning from the University of Maryland and a BS in Public Policy from Georgia Tech. He lives in Dupont Circle. He’s a member of the American Institute of Certified Planners, and is an employee of the Montgomery County Department of Transportation. His views are his own and do not represent those of his employer.