On the axis of the Capitol Building and Lincoln Memorial, there is a 169-meter-high marble obelisk, which is the famous Washington Monument. Looking out from the pillars of Lincoln Memorial and Jefferson Memorial, the monument is towering into the clouds and very tall, but the marble color of the part about 50 meters above the body of the monument is yellowish and slightly darker than that of the lower part, especially the color difference. Why is that? Originally, in memory of the first President of the United States, George Washington, Americans decided to build a monument for him, but the then U.S. government had no money. The monument was built entirely by public donations. After 10 years of donation, it was finally built in 1833. But when the tower reached 50 meters, the Civil War broke out in 1854 and the government was forced to stop building. Who would have expected that this stop would be 22 years, until the end of the war and raise funds to rebuild. When it was rebuilt, it was impossible to find the original stone, so it had to be re-selected to leave such traces of color difference, which was later called the traces of the Civil War. The monument can be visited at the top, but an appointment is required.