Iceland's Thrihnukagigur is your gateway to another world © Vilhelm Gunnarsson

Go inside a volcano The Thrihnukagigur volcano in Iceland may be dormant but this journey to the

centre of the earth is still pretty thrilling. After a 3km hike to the crater, to get to the ‘good bit’ you’ll still have to descend 120m into the opening via an open cable lift. Inside the Volcano (insidethevolcano.com) offer exclusive tours that'll take you beneath the earth’s crust where you can admire the kaleidoscopic colours and unique rock formations of the volcano’s crater.