Dumbarton Oaks Research Library and Collection, in Washington,D.C., institution in a Georgian-style mansion built in 1801 and housingByzantine art (4th–15th century), pre-Columbian art (in an addition of eight circular glass galleries designed by Philip Johnson), and three libraries: a 100,000-volumeByzantine collection, an 18,000-volume pre-Columbian collection, and a 13,000-volume gardening andlandscape architecture collection. The mansion (originally the home of William Hammond Dorsey), art collections, and book collections were all owned by Mr. and Mrs. Robert Woods Bliss, who presented them (along with funds to maintain them) toHarvard University in 1940. In 1944 the conference of representatives of theUnited States, the United Kingdom, China, and theSoviet Union that led to the founding of theUnited Nations was held at the mansion.