Cueva de los Verdes  or the Green Caves  are a natural attraction on the island of Lanzarote. The caves are made up of a kilometre of underground galleries with vertical interconnections between them. At some points there are three levels which allow visitors to discover new spaces from different perspectives and a fantastic optical illusion. The tunnel, which reaches a height of up to 50 metres, forms part of the volcanic tube which is connected to the nearby Jameos del Agua on the coast, which is a separate attraction in itself.  Entrance ticket to the Cueva de Los Verdes includes a guided tour lasting up to 45 minutes