Hoover dam tour free monorail passr r see where thousands of workers came to tame the colorado river and turn the black canyon into lake mead the largest reservoir in the us this bus tour of the hoover dam will take you by air conditioned motorcoach to the one of the most impressive manmade engineering projects in the worldr r after a short 45 minute trip youandrsquoll get the chance to undertake a vip experience in the heart of the dam the government guided discovery tour this gives yo