This museum is currently owned and managed by Harvard University, there are some amazing pieces from the Byzantine era, Pre-Colombian Art, a library with rare books and more.
The following from Wikipedia (
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The Dumbarton Oaks Museum features collections of Byzantine and Pre-Columbian art, as well as European artworks and furnishings. Mildred and Robert Woods Bliss initiated these collections in the first half of the twentieth century and provided the vision for future acquisitions even after giving Dumbarton Oaks to Harvard University.
The Byzantine Collection spans the imperial, ecclesiastical, and secular realms and comprises more than 1,200 objects from the fourth to the fifteenth centuries. Although the collection emphasizes objects of precious materials, underscoring the conception of Byzantine art as luxury art, the collection also includes large-scale works such as mosaics from Antioch and relief sculpture, as well as more than two hundred textiles and comprehensive holdings of coins and seals. It owns six manuscripts (see, e.g., Minuscule 705). In addition to its Byzantine holdings, the collection includes Greek, Roman, and western medieval artworks and objects from the ancient Near East, pharaonic and Ptolemaic Egypt, and various Islamic cultures.
The Robert Woods Bliss Collection of Pre-Columbian Art comprises objects from the ancient cultures of Mesoamerica, the Intermediate Area, and the Andes. Among its most important holdings are a variety of sculptures in stone, including carvings of Aztec deities and animals and several large relief panels bearing the likenesses of Maya kings. In addition there are sculpted anthropomorphic figurines and polished jade renderings of ritual objects from the Olmec, Veracruz, and Teotihuacan cultures as well as molded and painted ceramics of the Nasca, Moche, and Wari cultures. Gold and silver objects from the Chavín, Lambayeque, Chimú, and Inca cultures offer evidence of the expertise achieved by Andean metalsmiths, and over forty textiles and works in feathers testify to the importance of fiber arts in this region.
The House Collection consists primarily of Dumbarton Oaks' historic buildings and interiors, Asian, European, and American artworks, and interior furnishings. Principal to the collection is the renaissance-style Music Room. The ceiling and flooring of this room were inspired by examples at the guardroom of the historic Château de Cheverny near Paris and were fabricated by the Parisian designer, Armand Albert Rateau. The Music Room features displays of tapestries, sculptures, paintings, and furniture dating from the fifteenth to the eighteenth centuries. The Blisses used the room for hosting musical programs and scholarly lectures, and it continues to serve these purposes.