Plenty of cities in Europe could be described as an essential destination during a gap year, particularly the great capitals, such as Paris, Rome and Berlin, but no European tour is complete without a trip to Great Britain and the most iconic city of all – London. Whether a fan of traditional or alternative London sights, there is plenty to see and do and it’s possible to have a great time even when traveling on a budget. Most popular places to visit The Tower of London with its iconic Yeomen Guard (the beefeaters), a bodyguard force originally formed in 1485…