3. See: Picasso Museum
After five years of renovations, the Musée Picasso Paris reopened in October 2014 in the Hotel Salé, which was originally built between 1656 and 1660. The building's polished architectural details create a lovely backdrop for Picasso's extensive body of work. 

Also noted: The Foundation Louis Vuitton, an impressive Frank Gehry-designed building that had its inaugural opening in October 2014, and was founded by the LVMH group to support contemporary artists.