Shutterstock Hershey, Pennsylvania Milton Hershey broke ground for his chocolate factory in Derry Church, Pennsylvania, in ...

Wikimedia Commons/Mare Island Navy Yard The 1944 Port Chicago Explosion The Navy built Port Chicago Naval Magazine in 1942 to ...

Shutterstock Antelope Canyon Water carved this golden sandstone canyon over centuries near Page, Arizona on Navajo land. The ...

Wikimedia Commons/Warren K. Leffler, U.S. News & World Report The 1968 Poor People’s Campaign Martin Luther King Jr. planned ...

Shutterstock Manzanar National Historic Site The U.S. government forced 120,000 Japanese Americans from their West Coast ...

Wikimedia Commons/U.S. Navy USS Silversides The USS Silversides began service on December 15, 1941, eight days after the ...

The Pearl Harbor Avenger Portsmouth Naval Shipyard got orders to build new submarines on December 15, 1941, just eight days ...

Wikimedia Commons Ancient Architects of Wisconsin’s Animal Mounds The Late Woodland people built these mounds between 750 and ...

The Hopeton earthworks show off amazing building skills from people who had no modern tools. The main circle is 1,050 feet ...

Wikimedia Commons The Mitchell Prehistoric Indian Village The Mitchell villagers were among the first farming communities on ...

Wikimedia Commons/U.S. Navy The Navy’s Powerful F-4B Phantom II Fighter The F-4B Phantom II measured 63 feet long with a ...

The Yosemite Indian Village For nearly 4,000 years, Native Americans lived in Yosemite Valley before anyone tried to remove ...