The King’s Bath and Queen’s Bath are historic bathing pools within the famous Roman Baths complex in Bath, England.
The King’s Bath stands on the site of the Roman Sacred Spring and was first constructed in the 12th century, utilizing the foundations of the ancient Roman baths. This medieval bath featured niches where bathers could sit up to their necks in the heated, mineral-rich waters, believed to have healing properties.
Originally known as the New Bath, the Queen’s Bath was built in the 16th century next to the King’s Bath, providing cooler bathing facilities. It gained its present name after frequent visits by Queen Anne of Denmark in the early 17th century, who sought relief from illness in its waters.
The King’s Bath lies above the largest of Bath’s three hot springs and has been rebuilt across Roman, medieval, Georgian, Victorian, and modern eras.
 
Interesting facts.
The reason is is considered unsafe now is that stare travels through Roman lead pipes