Normally a ride on public transit isn’t so exciting other than the potential entertainment from homeless riders or lost tourists. Sweden, however, has found a unique way in which to entertain its riders. Welcome to the Stockholm Subway, also known as the world’s longest art exhibition. 90 out of 100 stations having been converted throughout the entire transit system, which spans at total of 110 kilometers. The subway network is truly a spectacle to behold, and a must-see destination for all visitors.