Peru, Cuzco, Machu Picchu, Old ruins of machu picchu. (Photo by: JTB/UIG via Getty Images) (Photo by: JTB Photo/UIG via Getty Images)
Credit: Getty Images

We've said it before, and we'll say it again: there are some time-sensitive bucket list destinations you need to put higher on your must-see list. According to ABC News, UNESCO recently announced a few more sites that are under threat: Peru's Machu Picchu; the towns of Omari, Japan and Lijiang, China; and Mont Saint Michel in France. This new status change is mostly due to environmental wear and the huge influx of tourist traffic that comes with being a UNESCO World Heritage Site. Although these sites have not officially made it onto the endangered list, 48 other destinations have, including Timbuktu, Everglades National Park, and the rainforests of the Atsinanana in Madagascar (among many others).

So what can you do as a worldly and aware traveler visiting these sites? Follow all of the rules—stick to designated paths and trails, don't climb anything, keep your hands to yourself, and, please for the love of all that is holy, do not run your drone into anything important. In fact, if someone were to follow Angkor Wat's lead and come up with a series of conduct video how-tos for all of the World Heritage sites, the world might be a slightly better place.

Erika Owen is the Audience Engagement Editor at Travel + Leisure. Follow her on Twitter and Instagram at @erikaraeowen.