In 2004, a large earthquake in the Indian Ocean triggered the largest tsunami in recorded history. One of the countries hit by the tsunami was Sri Lanka, where the wave caused one of the worst train disasters in human history when it hit the Queen of the Sea passenger line, which was carrying 1,500 passengers along Sri Lanka's west coast. Watch Destruction Decoded on Wednesdays at 8pm on National Geographic UK. | National Geographic UK

The city trip you need to take... As the second largest city in Austria, Graz has abundant art, culture, restaurants, and museums, keeping even the most ardent traveler entertained. Word of caution to the vegans and vegetarians heading to the city: Pack your stretchy pants, because mouthwatering plant-based options are a staple on just about every menu. Here is your guide to Graz: 🚞GETTING THERE🚞 I highly recommend taking the train. Graz is located in the lush Styria region, surrounded by beau