The Caves of San Jose are set within the raw and rugged Sierra de Espadan Natural Park, just 40 minutes from Valencia. But you’ll feel a million miles away from city life as you explore this prehistoric underground labyrinth. Hop on a boat or kayak for a tour along one of Europe’s longest underground rivers, which is loaded with stalagmites, stalactites and warped-looking rock formations. It opens up into large chambers like ‘the Cathedral’ and ‘the Bat Room’, all of which have been shaped by nature over thousands of years. As you glide along, keep an eye out for UNESCO-protected ancient cave paintings drawn by native communities around 30,000 years ago. If you’re craving some daylight after exploring underground, there’s also an archaeological complex that delves into life here during the Iberian Age and the days of the Roman Empire.