What is the most famous national monument in the United States?

The most famous national monument in the United States is the Washington Monument. Located on the National Mall in Washington, D.C., it honors George Washington, the first president of the United States. The monument stands 555 feet tall, making it the tallest obelisk in the world and a prominent feature of the D.C. skyline. The Washington Monument is a symbol of American history and patriotism and is a key stop for visitors touring the nation’s capital. It offers stunning views of the surrounding landmarks, including the U.S. Capitol and the Lincoln Memorial.