Zenkoji Temple in Nagano is a super important and popular spot in Japan. Dating back to the 7th century, it houses the first Buddhist statue ever brought into Japan. Visitors can check out the main hall with its ornate decorations, take a spooky walk through the underground passage, and even try to find the "key to paradise." Don't miss the cool pagoda with the Zenkoji History Museum and the Sanmon Gate with awesome views. Plus, there are shops and restaurants along the temple approach for some souvenir shopping and snacking!