Cueva Del Viento

If you are claustrophobic, Cueva Del Viento is not for you; otherwise, be prepared for a thrilling journey. You're about to enter Europe's longest lava tube, the world's sixth largest, only surpassed by those in Hawaii. The tunnels are 10.5 kilometers in length. The cave is deserving of its reputation as one of one of the most beautiful caves in Spain.

The tube is located in the village of Icod de los Vinos, which is located in the northeastern part of the Canary Island Tenerife. The best way to get there is from the capital, Santa Cruz. Lava flow from the Pico Viejo volcano, which is next to Mount Teide, created the tube.

The only way to see it is through a guided trip that begins at the tourist center. After being picked up by a car, you must proceed on foot through farmland and pine trees to the entrance, where you will be led inside and given 45 minutes to explore. The tour lasts two hours in total. This is a challenge for those who are reasonably fit.

Pro Tip: Because the tube's floor is uneven, you should wear hiking boots or strong shoes. You are not permitted to enter side passages or touch anything. Long trousers and the accompanying safety helmet must be worn at all times. If you become exhausted along the route, notify the guide right away.

Location: Tenerife