14. Al Siq, Jordan

Al Siq is special because it is actually the official gateway to ancient Petra. This canyon is only 1.2 kilometers (under one mile) in length but there are historical attractions to see. For example, there are the ruins of the 2,000-year-old plumbing system and the ancient wall carving of a camel too. Visit early in the morning and beat the crowds.

15. Buckskin Gulch, USA

Located on the border between Arizona and Utah, Buckskin Gulch is a stunning slot canyon that is perfect for hikers. It is 15 miles long and provides quite a challenge to hikers. There are large potholes filled with water and huge boulders to climb over too. You can hike there all year. However, if you attempt it in the colder months you will have to get a permit.