National Geographic has announced the winners of its prestigious Travel Photographer of the Year photo contest for 2017. The grand prize winner is Mexican photographer Sergio Tapiro Velasco, who shot this incredible photo titled “The Power of Nature,” which shows lightning striking an erupting volcano. The photo was captured on …

Rapid transit, also known as heavy rail, metro, subway, tube, or underground, is a type of high-capacity public transport generally found in urban areas. Unlike buses or trams, rapid transit systems are electric railways that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles of …