US museum unveils massive expansion in praise of ‘slow art’


It may be the greatest art collection you’ve never heard of — until now.

With a sprawling gallery space opening Thursday in a prosperous exurb of Washington, Glenstone has become one of the world’s biggest private art museums.

At a time when museums are courting Instagram-hungry crowds and visitors have to elbow each other to catch a glimpse, Glenstone has carefully choreographed a journey in the opposite direction as part of its $200 million expansion.