Black Square by Kazimir Malevich
This painting has always become hostile between people. The first pictures show the style of Cubo-Futurism and in the second which is in black, it is considered as proto-Suprematism.

Young Woman with Unicorn by Raffaello Sanzio
In the start of this painting, the artist just thought of painting a woman with a unicorn but then he changed his plans and made her a saint and then since the unicorn did not go right with the concept so they decided to removed it.

L’Angelus by Jean-François Millet
The famous artist — Salvador Dali solved the mysteryof this painting. In this painting at first it wa snot clear that why the man and the woman are so sad but later deeply studing it became clear that there is a body of a unbaptized child who bit good bye to the world and it was hidden under the field.

An Old Man in Military Costume by Rembrandt Harmenszoon van Rijn
Rembrandt, just like other artists he also though of draing another painting over one and the scientists found one more portrait under the painting and the specialists found that another painting in the frame is of his artist's father.

Patch of grass by Vincent van Gogh
Belgian and Dutch scientists discovered a secret layer in the painting and it was a Patch of grass drawn in green-blue shades and the hidden picture is in red-brown. And the secret picture is of a woman, whose identity is not known.

Lady with an Ermine by Leonardo da Vinci
French engineer Pascal Cotte discovered the popular painting by Leonardo da Vinci, where a women is standing with an animal in the panting, as per reserch the animal was added later by the artist. Few therioes stated that the lady was pregnant and she used it to cover her belly and other theories were explained.

The Enchanted Pose by René Magritte
This painting was only clearly seen during the 20th century and after that it vanished but in 2013 the Senario changed and the employees of Museum of Modern Art in New York found out that the painting x rayed the painting of a girl from the missing painting and the other lost parts of the painting in other paintings but since the museum can't destroy other painting so the mystery remained unsolved.

View of Scheveningen Sands by Hendrick van Anthonissen
Just like all the other artist even this artist did the same thing, he drew and then he chnaged his mind. After the old polish was reserched, they found that shape of a a man looking at something that resembled a sail and later after they reserched more they discovered that the artist painted a whale and the person was standing on it.

Mona Lisa by Leonardo da Vinci
Mona Lisa is considered as one of the greatest paintings ever, it is Leonardo da Vinci's masterpiece. Few of tem say that just like other paintings even this paintings has another layer of painting on it while some do not believe it.