-What you can expect- Iceland's landscapes are marked by caves, bubbling hot springs and volcanoes – but on this tour, you'll delve into an extraordinary lava tube formed thousands of years ago. You'll join your guide and walk along century-old lava that's now one of the biggest natural caves on the island – Raufarholshellir.Located just outside Reykjavik, the Lava Tunnel is a spectacular natural feature that lets you explore deep into the earth. You'll find out all you need to know about how the cave was first created all those years ago as your guide navigates the pathways, stairs and footbridges for you.You'll have an hour-long tour inside this colossal 1,360-metre-long cave, where you'll come across staggering rock formations and kaleidoscopic colours, made all the more intense with light installations. It's so atmospheric that even scenes from big Hollywood films were made here – it's magical.