Where: East Java, Indonesia
Why you should go: The Ijen Crater is one of only two volcanoes in the world that is known for blue lava; the second such volcano is in Iceland. To reach there, you must complete a two-hour hike to the mouth of the crater and then an additional 45-minute descent into the crater.
4. Chefchaouen
Where: Rif Mountains, Morocco
Why you should go: Much like the blue city of India, Jodhpur in Rajasthan, Morocco's pretty blue child is the quaint town of Chefchaouen. It is fast becoming a popular destination for tourists (already one for most) and the fact that it has handicrafts that you're not going to find anywhere else, is an added plus.