At Vall D’Uxo, in the San José Caves, you will discover a magical site—the longest navigable underground river in Europe. You’ll enter the underground realm in a boat that drifts along calm waters, Inside the cavern you will contemplate the capricious formations of the rocks that the water has molded during thousands of years, and stalactites and stalagmites that have grown at the rate of an inch a century. Listen to the sound of silence in a place where it is possible to discern the murmur of the water and to hear the echo of a drop of water falling into an underground lagoon, a beautiful landscape that nature keeps hidden from the light. Your boat trip will take you through the Bat Cave, the Dog Kennel and Diana’s Lake. It is a relaxing experience and afterwards you will head back to Valencia to view the highlights of the city. You’ll take the Avenida Baleares and cross the river, continuing on the Gran Via and Calle Jativa, past the Bullring and Central Station. At the Central Square, you’ll walk to admire the Gothic-style buildings that house the Silk Exchange (an exhibition pavilion) with an impressive façade constructed on helicoidal columns. From Central Square, a panoramic drive brings you to the Carmen Quarter, Torre de Quart, Case de Beneficencia and the IVAM (a modern art museum). You will proceed to Torres de Serrano to view the Plaza de la Virgen (the Virgin of the Forsaken Basilica) and have some free time at the cathedral to explore outside. Return to the ship by way of the panoramic bridges, passing the City of Art and Sciences designed by local architect Santiago Calatrava. This tour is provided by an operator that has been third-party certified to meet the Global Sustainable Tourism Council's Criteria for Tour Operators.