In the 1930s, workers bored a 13-mile tunnel beneath Mt. San Jacinto. Here's a look inside the engineering feat that carries ...

From threading through skyscrapers, diving into volcanoes - or jumping into the jet stream - the Chilean wingsuit pilot continues to redefine the limits of human flight.

Lake Garda's treasures vary from north to south ... which also boasts a close-by and intriguing 100-metre waterfall inside a tunnel. You can take a cable car up to Monte Baldo summit station ...