It wasn’t until 2009 that professional cavers explored the world’s largest cave passage, which stretches for two-and-a-half miles and reaches 300 feet wide and more than 600 feet high. It’s concealed under dense tropical rainforest in Vietnam's Phong Nha-Ke Bang National Park. Photo courtesy of globaltouring on Instagram.
THE TOWN WITH NO ROADS Giethoorn in Holland is a beautiful and quiet little village unique in that you will not find a single road in the entire town. Rather, it is connected by waterways and paths and some biking trails. Visitors are always welcomed and encouraged to rent an electric and noiseless "Whisper Boat" to explore this little piece of heaven on earth.