Large clock displays Arizona time at the Hoover Dam on the Nevada and Arizona state border. heart_plus. Download shopping_cart.The Clock of the Long Now, also called the 10,000-year clock, is a mechanical clock under construction that is designed to keep time for 10,000 years. UNLV's clock tower, located between the law school building and Tam Alumni Center, usually chimes the popular "Westminster" tune every half hour from 7 a.m. There is a huge clock inside a mountain that will tick for 10,000 years. Download Image of Caesar's palace las vegas nevada building. A large building with a clock on top of it. A monument scale mechanical clock, built inside a mountain, designed to keep accurate time for the next ten millennia.