The focus of the museum is Greek history - art, objects, manuscripts, photography and on and on. there are also collections of Chinese, Coptic and Islamic Art.


here's a blurb from the Benaki Museum website:

This group of collections comprises many distinct categories totalling more than 30.000 items illustrating the character of the Greek world through a spectacular historical panorama: from antiquity and the age of Roman domination to the medieval Byzantine period, from the fall of Constantinople (1453) and the centuries of Frankish and Ottoman occupation to the outbreak of the struggle for independence in 1821, and from the formation of the modern state of Greece (1830) down to 1922, the year in which the Asia Minor disaster took place.


http://www.benaki.gr/index-en.htm

I'm not sure how far away Delphi is, but it was an all day excursion.