The Dutch artist Escher is known for his optical illusions, and one of the best places to see his work is at Escher in the Palace.
It's a museum dedicated to the artist located in the Dutch city of the Hague, and was opened in 2002. As well as being home to hundreds of Escher's prints and drawings, the museum also features interactive illusions; one room uses mirrors to make children appear larger than adults.
Children can also make their own linoleum cut artwork, and another section chronicles Escher's life and career. It's all housed in a beautiful 18th century palace.