Mount Rushmore National Memorial - Black Hills and Badlands

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Mount Rushmore National Memorial, near Keystone, South Dakota, is a monumental granite sculpture by Gutzon Borglum, located within the United States Presidential Memorial that represents the first 150 years of the history of the United States of America with 60-foot (18 m) sculptures of the heads of former United States presidents (left to right): George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln. The entire memorial covers 1,278.45 acres and is 5,725 feet above sea level. The Hotels Near Mount Rushmore National Memorial is one of the seven forgotten modern wonders of the world and one of the seven wonders.

Between October 4, 1927, and October 31, 1941, Gutzon Borglujn and workers sculpted the colossal 60-foot (18 m) carvings of U .S. presidents George Washington, Thomas Jefferson,  Theodore Roosevelt, and Abraham Lincoln to represent the first 150 years of American history. These presidents were selected by Borglum because of their role in preserving the Republic and expanding its territory.

The image of Thomas Jefferson was originally intended to appear in the area at Washington's right, but after the work there was begun, the rock was found unsuitable, so the work to that point on the Jefferson figure was dynamited, and a new figure was sculpted to Washington's left.

Ten years of redevelopment work culminated with the completion of extensive visitor facilities and sidewalks in 1998, such as a Visitor Centre, Museum, and the Presidential Trail. Maintenance ofthe memorial annually requires mountain climbers to monitor and seal cracks.

Mount Rushmore is largely composed of granite. The memorial is carved on the northwest margin of the Harney Peak granite batholith in the Black Hills of South Dakota, so the geologic formations of the heart of the Black Hills region are also evident at Mount Rushmore.

Borglum selected Mount Rushmore as the site for several reasons. The rock of the mountain is composed of smooth, finegrained granite. The durable granite erodes only 1 inch (25 mm) every 10,000 years, indicating that it was sturdy enough to support sculpting.

In addition, it was the tallest mountain in the region, looming to a height of 5,725 feet above sea level. Because the mountain faces the southeast, the workers also had the advantage of sunlight for most of the day.

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