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Check out some fascinating facts that you can use to impress your friends and family when you take a tour of Mount Rushmore:

• Rushmore's granite faces tower over 5,500 feet above sea level.
• The carvings are scaled to men who would stand 465 feet tall.
• Each President's head is as tall as a six-story building.
• Over 800 million pounds of stone was removed from Mount Rushmore during the construction.
• Workers have to climb 506 steps to reach the top of Mount Rushmore each day to work.
• The president's noses are 20 feet long, their mouths 18 feet wide, and their eyes are 11 feet across!
• No deaths occurred during the whole period of carving, just a few minor injuries despite the heights they had to deal with and the use of a huge amount of dynamite for construction.
• Thomas Jefferson was originally started on George Washington's right. However, after 18 months they realized that it was not working. Jefferson's face was dynamited off and carved on the other side.
• The sculpture cost $989,992.32 to build.
• There is a cave behind the carving called the "Hall of Records." It was intended to house the story of Mount Rushmore but was never completed due to lack of funding.
• The estimated erosion rate is 1 inch every 10,000 years.
• The designer chose the south-facing slope of this 5,725-foot mountain so that his sculpture would remain in sunlight throughout the day.
• Workers carved 90 percent of the monument with strategically placed charges of dynamite. They shaped the rest of it with air hammers.
• The bust of Washington was dedicated in 1934, followed by those of Jefferson (1936), Lincoln (1937), and Roosevelt (1939).
• While writing the screenplay for director Alfred Hitchcock's North by Northwest, Ernest Lehman tried—and failed—to scale the monument's faces.
• In 2005, the memorial received its first and only cleaning when workers spent three weeks removing dirt and lichen.