The story of Madonna of the Pinks

The story of this painting is very interesting.
For many years the painting was considered as the best of several copies of a lost Raphael's original (worth 2,500 pounds). In 1991 was recognized as original (only thanks to the fact that the Renaissance scholar - and now the director of the British Gallery - personally visited the place). In 2004 the painting was sold for 35 million pounds.
This visit paid off. The price of the painting increased 14 000 times.

Check your walls whether you don't have originals there.

Wiki:

Only in 1991 was the painting identified as a genuine Raphael, by the Renaissance scholar Nicholas Penny. Although Raphael scholars were aware of the existence of the work, which had hung in Alnwick Castle since 1853, they considered it merely the best of several copies of a lost original. After a huge public appeal the Madonna of the Pinks was bought in 2004 by the National Gallery from the Duke of Northumberland for £34,88 million, with contributions from the Heritage Lottery Fund and the National Art Collections Fund. To justify the vast expenditure it went on a nationwide tour to Manchester, Cardiff, Edinburgh and Barnard Castle.

British National Gallery:

This small devotional picture was painted for Christian contemplation; its original owner would have held the painting in his or her hand. It shows the Virgin and Child seated in a bedchamber (the bed-curtain is looped behind the Virgin's head) with a view of a sunny landscape seen through a window. They hand flowers between them - pinks which are symbols of marriage - depicting the Virgin Mary as not only the Mother but the Bride of Christ.