Take no Yu

A 2011 renovation at this long-running Azabu-Juban bathhouse brought Take no Yu into the modern era, just shy of its centennial. The chief attraction here is the mineral-rich, black-brown onsen water, which is so prized that customers can even pay ¥20 per litre to bottle the stuff up and take it home. Actually bathing in it can feel like taking a dip in a cup of coffee, though you no longer need scald yourself in the process: the renovations included splitting Take no Yu's bathtubs into two separate sections, according to temperature.