Riot police at the Democratic National Convention in Denver

Protesters at the Democratic National Convention in Denver

Kelly Miller Circus in Hudson Oaks, Texas

Makeshift dressing room at the Kelly Miller Circus in Hudson Oaks, Texas

Warehouse fire in south Dallas

High Park Fire near Fort Collins, Colorado

Aftermath of a tornado near Windsor, Colorado

Flooding near Weatherford, Texas

Fire training near Mineral Wells, Texas

Worker at a natural gas rig near Hudson Oaks, Texas

Migrant worker at a grain mill in Aledo, Texas

Drought conditions northeast of Dallas

Longhorn near Aledo, Texas

Kayaker on the Platte River in Denver

Family in Weatherford, Texas

Hurricane Katrina evacuees in Hudson Oaks, Texas

Denver Museum of Nature & Science

Guard at Joint Security Area between North Korea and South Korea

Giraffe at the Denver Zoo

Professional snowboarder Scotty Lago

Abandoned home near Colorado's Great Sand Dune National Park & Preserve