Thermae Romae

Thermae Romae is a Japanese manga series created by Mari Yamazaki. The manga series was adapted into an anime series and live-action film. The story of Thermae Romae revolves around an ancient Roman architect called Lucius who is down on his luck and all out of ideas. One day as he wonders in the area under the spa, he comes a cross a hidden tunnel that leads him to modern-day Japan where he sees modern bath houses. He gets inspired and creates a modern-day spa called Roma Thermae.