Lukács Baths

Lukács gyógyfürdő) is a historic indoor/outdoor thermal bath spa in Budapest, Hungary, heated by natural hot springs.

Thermal baths have been used at this location since at least the 12th century (by the Knights Hospitallers), and as part of the interior there is a wall that is a remainder of a former Ottoman powder mill (the Császár mill) which used the hot spring water as a source of power.

This spa was expanded with a drinking-water hall constructed in 1937, and in 1979 a health clinic was added.

It was redesigned in 1844 by József Hild, and is now part of the National Institute of Rheumatology and Physiotherapy.

The hot spring water is rich in calcium hyrodgencarbonate, calcium hydrogensulfite, and magnesium hydrogencarbonate and magnesium hydrogensulphate; chloride; and also contain sodium and a substantial content of fluoride ions.