On Tuesday, we featured the 110th challenge to see how well you knew the Metro system. Here are the answers. How'd you do?

This week, we got 33 guesses. 17 got all five correct. Great work!

The first image shows the entrance pylon at Virginia Square. You can make out “Square” in the station name, which narrows the field to five stations. Recognizing the FDIC buildings in background was probably the easiest way to solve this one.

All but one of you guessed correctly on this one.

The second image shows an entrance at National Airport station. The yellow columns are also clues. Careful examination reveals an MWAA logo on the rug outside the entrance.

This one was a breeze! Everyone knew it.

The third image shows the canopy at Largo, viewed from the southern parking garage. The Gull II roof is present at only three stations, and a vantage point like this would be impossible at Morgan Boulevard, where there are no tall buildings nearby. The tracks there are also below the mezzanine, not directly under the canopy. At NoMa, a view from one of the buildings west of the tracks would also show the Amtrak tracks to the east, rather than a blank wall.

That leaves Largo, which is situated between two parking garages. 24 figured it out.

The fourth image shows a sign outside Woodley Park directing patrons to the elevator, which is located a block north of the escalator entrance. The Wardman Tower is visible in the background, and you can also just make out the “Zo” in “Zoo” on the pylon at bottom right.

25 knew this one.

The final image shows the eastern entrance to Bethesda station. This entrance is in the atrium of an office building, and the tunnel leads under Wisconsin Avenue to the bus loop at the top of the main station escalator. The art in the corridor rotates, but is still a distinctive feature, and you can see some of the photographs currently on display through the glass doors.

20 came to the correct conclusion.

Great work, everyone. Thanks for playing! We'll be back in two weeks with week 111.

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.