Diego Velazquez's Las Meninas is one of the most famous paintings ever produced.

BBC: Too famous to see?

Diego Rodriguez de Silva y Velazquez (1599 - 1660) was the leading artist in the court of King Philip IV of Spain, and is best known for his portraits of the royal family, including his masterpiece, Las Meninas.

CNN: Newly-discovered Velazquez portrait sells for $4.7m

Back in his London studio, he persuaded a friend to place a blindfold over his eyes, escort him by taxi to Heathrow, catch a flight to Madrid, lead him into the Prado museum, and position him in directly in front of Velazquez's Las Meninas.

BBC: Too famous to see?