A passing lane (North American English) or overtaking lane (British, Irish and Australian English) is the lane on a multi-lane highway or motorway closest to the center of the road (the central reservation). In some countries, lanes are described as being on the 'inside' or the 'outside' of a road - which one the passing lane is varies.
When Italian handyman Vincenzo Peruggia stole the Mona Lisa from the Louvre in 1911, he never could have guessed her absence would be the very thing that made her the most recognizable painting on the planet.
It wasn't until December 1913 -- exactly 100 years ago next month -- that Peruggia was finally caught and the Mona Lisa recovered, becoming the best known painting in a time before we shared images on TV, internet, and phones. Read: Prado Museum displays unique copy of Mona Lisa.