Unrecorded and unfinished portrait by Rubens is up for auction and is worth up to £6m, but who is the lady with the determined chin?

13 etchings by Picasso have come to light after a Spanish professor discovered them in a book owned by the artist's muse, Dora Maar.

Bilbao is better known for Frank Gehry's Guggenheim turns to city planning, with a beautiful new park designed by ACXT.