What is a ellipse what buildings flank this area?

An ellipse is a geometric shape that resembles a stretched circle, defined as the set of points where the sum of the distances from two fixed points (the foci) is constant. In architectural contexts, ellipses are often found in the design of parks, plazas, or iconic buildings. For instance, in Washington, D.C., the Ellipse is a park located south of the White House, flanked by significant structures like the White House itself and the Washington Monument.