[Answer] Which of these U.S. landmarks is held together by gravity and friction alone?

Step 1 : Introduction to the question "Which of these U.S. landmarks is held together by gravity and friction alone?"

...1. Gateway Arch 2. Statue of Liberty 3. Washington Monument 4. Space Needle

Step 2 : Answer to the question "Which of these U.S. landmarks is held together by gravity and friction alone?"

Washington Monument - The Washington Monument is often referred to as the world’s tallest free-standing masonry structure, but it’s technically not a masonry building at all. Those structures are traditionally held together by mortar, but the giant marble blocks of the 555-tall Washington Monument are held together only by gravity and friction, according to the National Park Service. (There is some mortar on the outside, but its purpose is for weatherstripping.) Built as a memorial to the first president of the United States, the Washington Monument is the tallest building in the nation’s capital — in fact, by law, no building can be constructed in Washington, D.C., to exceed its height. When it was first erected in 1848, it stood as the tallest structure in the world until the Eiffel Tower was built in 1887.:

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