Urban Explorers (2006)

Urban Explorers is an adventure into the past: four trekkers entering into dangerous terrain to uncover secrets about some of America's greatest cities. The team of experts includes an urban historian, a structural engineer and two world-class, urban climbers. From abandoned train stations, theaters and hospitals to sewers, underground railways and hidden hideaways, they will discover hidden gems and a unique insight into this nation's meteoric growth. But look quick - these secrets are fast being eroded and it is up to the Urban Explorers to find them before it is too late.