The Power of Baths First Part / Second Part
Lucius is sent to a hot spring near Vesuvius to build some public baths, managing to enlighten some smelly robbers living there. When he slips up, he once again enters modern Japan, discovering a city filled with public baths.
Aired 27/01/2012EP 3 - The Power of Baths First Part / Second Part

2012
Thermae Romae
The story is a comedy about Lucius, an architect of public bath houses in ancient Rome, who time-travels to various modern-day baths in Japan. The author explores the two cultures in the world "that have loved baths the most: the Japanese and the Romans."
(Source: Wikipedia)