These fountains, built in 1967, clearly show the structure of the original rock; note the large, light-red crystals of the mineral feldspar. The fountains were constructed from blocks of the oldest rock in the United States‚ 3.5 billion years old.
Also, from the Washington Post:
Enid Annenberg Haupt, 99, a publishing heiress whose passion for the glories of nature inspired her to give millions of dollars in support of public gardens, horticultural institutions and other green spaces in Washington, New York and around the world, died Oct. 25 at her home in Greenwich, Conn. No cause of death was reported.
Mrs. Haupt, daughter of publisher Moses L. Annenberg and sister of publisher and philanthropist Walter H. Annenberg, also donated millions to Memorial Sloan-Kettering Cancer Center and the Metropolitan Museum of Art in New York, the National Gallery of Art in Washington and numerous other institutions.
Enid A. Haupt funded the Haupt Fountains on the Ellipse and made a gift of the four-acre garden on the south side of the Smithsonian Institution Castle.
Enid A. Haupt funded the Haupt Fountains on the Ellipse and made a gift of the four-acre garden on the south side of the Smithsonian Institution Castle. (New York Botanical Garden)
In Washington, she underwrote the Haupt Fountains on the Ellipse between the White House and the Washington Monument and made a gift of the four-acre Victorian-style garden on the south side of the Smithsonian Institution Castle, now known as the Enid A. Haupt Garden.