The Jeferson Memorial, located at the last of the Ten Spheres, is one of three of the spheres marked by buildings designed by John Russel Pope. You will note that the land on which the memorial was built, did not even exist at the time of the original foundation of the Capital City.
In 1934, Congress passed a resolution to establish a Thomas Jefferson Memorial Commission to plan, design, and construct the memorial. The design for the project submitted by John Russell Pope was composed of a circular dome based on the Pantheon in Rome, just as Jefferson had himself used for his home at Monticello and the University of Virginia. In 1936, this design was accepted and the ground-breaking occurred.
The memorial features a statue of Jefferson as the centerpiece, which stands 19 feet tall and weighs 10,000 pounds.