View of Grand Canyon from the South Rim looking to the north toward Bright Angel Canyon, Arizona.

View of Grand Canyon from the South Rim looking to the north toward Bright Angel Canyon, Arizona.

View of Grand Canyon from the South Rim looking to the north toward Bright Angel Canyon, Arizona.

View of the Grand Canyon in Arizona.

Taking a break on the side of the road near the Grand Canyon in Arizona.

View of the Grand Canyon in Arizona.

Robert Annis and F.C. Angus posing at the rim of the Grand Canyon.

View of Grand Canyon from the South Rim looking to the north toward Bright Angel Canyon, Arizona.

Cars lined up at the shore of lower Lake Mead waiting for the carferry.

Carferry transporting cars across lower Lake Mead in Arizona.

Construction of Hoover dam on Colorado River on the border of Arizona and Nevada.

Construction and equipment on the Hoover Dam.