niood lists the 10 Most Controversial Artworks That Changed Art History:

1. Damien Hirst, For the Love of God, 2007

For the Love of God 2007 is a life-size platinum cast of an eighteenth century human skull, covered by 8,601 flawless diamonds, inset with the original skull’s teeth. At the front of the cranium is a 52.4 carat pink diamond. Since it was first exhibited in 2007, For the Love of God has become one of the most widely recognised works of contemporary art. It represents the artist’s continued interest in mortality and notions of value.

This work of art was very controversial and generated many polemics, because of its huge cost and use of a human body part.

Damien Hirst diamond set skull 'For the Love of God' - Bentley & Skinner,  the Mayfair antique and bespoke jewellery shop in the heart of London

2. Pablo Picasso, Guernica, 1937

Picasso painted Guernica at his home in Paris in response to the 26 April 1937, bombing of Guernica, a Basque Countrytown in northern Spain which was bombed by Nazi Germany and Fascist Italy at the request of the Spanish Nationalists. Upon completion, Guernica was exhibited at the Spanish display at the 1937 Paris International Exposition, and then at other venues around the world. The touring exhibition was used to raise funds for Spanish war relief. The painting soon became famous and widely acclaimed, and it helped bring worldwide attention to the Spanish Civil War.

As early as 1968, Franco had expressed an interest in having Guernica come to Spain. However, Picasso refused to allow this until the Spanish people again enjoyed a republic. He later added other conditions, such as the restoration of “public liberties and democratic institutions”.

Pablo Picasso | Il Guernica, 1937 | Art in Detail | Tutt'Art@ | Pittura •  Scultura • Poesia • Musica

3. Marcel Duchamp – Fountain, 1917

Fountain', Marcel Duchamp, 1917, replica 1964 | Tate

4. Andy Warhol, Campbell’s Soup Cans, 1962

Andy Warhol. Campbell's Soup Cans. 1962 | MoMA

5. Andres Serrano, Piss Christ, 1987

3 religious artworks that caused a scandal | Artsper Magazine

6. Guerilla Girls, Do Women have to be naked to get into the Met. Museum?, 1989

Do Women Have To Be Naked To Get Into the Met. Museum?', Guerrilla Girls,  1989 | Tate

7. Ai Weiwei, Dropping a Han Dynasty Urn, 1995

Ai Weiwei - Dropping a Han Dynasty Urn (1995) : museum

8. Tracy Emin, My Bed, 1998

Nice process video from Tate on how Tracey Emin installs her Bed

9. Jackson Pollock, Blue Poles or Number 11, 1952

Here's looking at: Blue poles by Jackson Pollock

10. Édouard Manet, Le Déjeuner sur l’Herbe, 1863

Le Déjeuner sur l'herbe - Wikipedia