On May 10th, 1869, in Promontory Summit, Utah, two sets of ordinary railroad tracks met under extraordinary circumstances. Together the Central Pacific and Union Pacific railroad companies, building from Sacramento, California, and Omaha, Nebraska, joined to revolutionize travel. Before that day, a single person would pay $1000 to travel from east to west in the United States. On a steam engine train, it only cost $150. More than 1700 miles of track were laid in just seven years, across deserts, over plains, and through mountains. Its completion was one of the most defining moments in our nation’s history.

On today’s episode of America’s National Parks, the Golden Spike National Historical Park, and the nation’s first transcontinental railroad, celebrating its 150th anniversary this May.