In Teramachi, fascinating Myōryū-ji (aka Ninja-dera), completed in 1643, was designed to protect its lord in case of attack. It contains hidden stairways, escape routes, secret chambers, concealed tunnels and trick doors. Contrary to popular belief, this ancient temple has nothing to do with ninja. Admission is by tour only (in Japanese with an English guidebook). You must phone for reservations (in English).