Nanatsugama Caves which are located in Saga prefecture are a stunning geological feature. Born from a volcanic lava plateau, a combination of tidal forces and strong waves have eroded a series of caves through the plateau. Accessible by several cruise boat providers, you will get an opportunity to travel onboard through one of the caves. Meanwhile, above the caves, there is a walking trail and a lookout you can stand over. A scenic location for either a hike, or a family boat ride that you can bring the kids on, the Nanatsugama Caves are great for all sorts of travelers.