These 150m-high caves wave-punched into a cliff wall that used to be submerged are the site of the earliest human inhabitation of Taiwan. The archaeology is explained in a small centre before you head up. The insides of most caves have been turned into colourful Buddhist shrines. Interestingly, the second cave is the home of an 80-year-old Buddhist monk, originally from Guangdong in mainland China, who has been living among donated furniture, religious icons and wild monkeys for the last half-century.
Take Provincial Hwy 11 and follows signs to the Caves of the Eight Immortals after passing Dongho (東河) and Chenggong (成功).