An overpass carrying a subway train has collapsed in Mexico City, killing at least 23 people, according to local government officials. CCTV surveillance footage shows the moment the overpass collapsed. CNN’s Matt Rivers reports.

The Rise of Eco-Tourism: How Travelers Are Choosing Sustainable Travel Options
The Shift Towards Sustainable Travel In recent years, there has been a significant shift in the way people travel. More individuals are opting for environmentally