SERIAL CITY BREAKERS and armchair urban explorers can win KLM flights, just by identifying the location of a mystery landmark.But it's not as easy as it sounds, and that's what makes this travel contest particularly addictive.
Every day at 4 pm (GMT) until April 24 the Dutch airline will tweet (from @KLM) a link to photos of mystery landmarks. Then you have to recognise the landmark and plot its Secret City location on an integrated Google map.
The day's winner is the person whose little red flag is plotted closest to the landmark.
What can you win?
A pair of return flight tickets to one of 5 secret cities featured each week. You choose from the 5 cities.
Last week's winner chose Santa Monica from Cape Town, Santa Monica, Prague, Singapore and Goteborg.
He tweeted: "Guess I'm a bit overexcited now, but c'mon…I WON! And look how happy he looks about it.
Don't expect to see the Eiffel Tower or the Leaning Tower of Pisa just yet. So far these photos have been tricky to identify, even for self-proclaimed city experts. Ahem...like me. I've edited city guidebooks and travelled around to see, climb and photograph urban architecture, everywhere from Cairo to the bell towers (or as historians tell us, penis extensions) built by the wealthy during the Italian Renaissance.
But, I sucked at yesterday's mystery landmark. My guess (and I'm too ashamed to tell you what it was) turned out to be 2710 km from the correct location!
Now I'm determined to guess today's Secret City correctly. Roll on 4 pm.
How to win
Most importantly follow KLM on Twitter @KLM.
The beauty of Google maps being that you can zoom in until your flag sits directly on top on the landmark (assuming you've guessed the correct location).
To move the flag click elsewhere on the map - no dragging necessary.
Make sure you guess all 5 cities every week, from Monday to Friday. The person closest to the landmarks everyday of the week will win.
What if more than one person guesses correctly all week?
Then the winner will be the person who planted their flags the fastest.
Phone a friend
Or in this case Tweet a friend to help you guess the secret city, by clicking the Tweet button below the photo.
How to be disqualified
By entering from multiple Twitter accounts.
Happy guessing city breakers. I'll be trying again at 4pm today!