These Time-Warp Photos Show Six Cities In the Past and Present

Cities change: skyscrapers go up, row houses are torn down, neighborhoods gentrify, earthquakes destroy. Vintage photographs of cities can be fascinating in and of themselves, but the familiar unfamiliarity of these time-warped photographs are especially intriguing. » 4/01/14 9:00am 4/01/14 9:00am

This Colossal Dam Keeps Russia's Capital City Above Water

When Tsar Peter the Great founded the former Russian capital city of Saint Petersburg more than 300 years ago, he intended it to provide a "window on the Baltic." Turns out, that window was more of a screen door. To protect itself, the city built a dam that took almost 300 years and $3.85 billion to complete. » 9/09/13 2:00pm 9/09/13 2:00pm