Clock Tower Thrift Shop is a large thrift store that benefits Northern Virginia Family Service, a nonprofit organization that seeks to empower individuals and families to improve their quality of life. NVFS provides medical and dental care, child abuse prevention, job training, foster care, family counseling, emergency financial assistance, and more to families in need. The thrift shop is stocked with new and slightly used items of all varieties, including clothing, books, housewares, decor, knick-knacks, and appliances, with all proceeds going to NVFS. You can contribute goods until 5pm; call for details. The store is staffed entirely by volunteers.