In the early days of the 20th century, an entire team disappeared while on an expedition deep into the Grand Canyon in search of a long-rumored hidden city.In the early days of the 20th century, an entire team disappeared while on an expedition deep into the Grand Canyon in search of a long-rumored hidden city.In the early days of the 20th century, an entire team disappeared while on an expedition deep into the Grand Canyon in search of a long-rumored hidden city.