The Hay Wain
From Tardis Wiki, the free Doctor Who reference
The Hay Wain was a painting by John Constable. It depicted a horse and cart.
The Twelfth Doctor, who proclaimed it to be one of the finest works of art in history, took Jess Collins to see the painting at the National Gallery in 1972. (COMIC: Bloodsport)
In 2003, Jess Collins was showing the painting to a group of students, when she noticed the Twelfth Doctor and the TARDIS in the picture. (COMIC: Doorway to Hell)
In 2022, it was among fifteen paintings removed from public view after being defaced to depict the Spy Master in his Grigori Rasputin disguise. (TV: The Power of the Doctor)