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Explorer Robert Kennicott disappeared one day in 1866. For more than a century, the cause of his death has been a mystery — but the Smithsonian has solved it.

Human remains found deep in Brazil's Amazon have been identified as belonging to British journalist Dom Phillips, according to Brazil's federal police.

Ten years ago, Hurricane Katrina ravaged a swath of Louisiana's shoreline. Since then, residents determined to rebuild near the coast have a new mantra: high and dry.

The U.S. Department of Homeland Security and Mexican officials are investigating an incident earlier this week along the border. A rural Texas sheriff accuses the Mexican army of protecting a drug smuggling operation. Mexico denies its military was involved.

As a heatwave grips the middle third of the country, Texas residents have been dealing with triple-digit heat for nearly two weeks. That's unusual for June and forecasters say there's more to come.

Days of torrential rain have caused dams to overflow and waterways to break their banks, bringing a fourth flood emergency in 16 months to parts of the city of 5 million people.

Russian forces are strengthening their positions in a grueling fight to capture the last stronghold of resistance in eastern Ukraine's Luhansk province, the region's governor said Sunday.

This year marks the 400th anniversary of the first permanent English settlement in America at Jamestown. And that makes Bill Kelso — the man who excavated the site — one very happy archaeologist.

Railroad tycoon Leland Stanford drove the golden spike that connected the country's first transcontinental line in 1869, setting off decades of fierce competition for routes to the Pacific. Historian Walter Borneman follows the rails in his new book, Rival Rails: The Race to Build America's Greatest Transcontinental Railroad.

Authorities are distributing iodine tablets as Ukraine and Russia traded blame over threats to the Zaporizhzhia plant.