was the most polluted city overall. However, the report found Mayaguez in the U.S. Commonwealth of Puerto Rico had the cleanest air of any metro area around the world with a PM2.5 level of just 1. ...

Built over 2,000 years ago, the iconic desert city continues to mesmerize tourists and archaeologists alike. Ad Deir, or the Monastery, is one of Petra's many facades carved out of sandstone in ...