Styled as a brick fortress, the 19th century Butyrka prison in central Moscow has held a slew of notable figures behind its bars, from persecuted Soviet-era writers Alexander Solzhenitsyn and Isaak Babel to Adolf Hitler's nephew Heinrich.
"We are developing additional medical services ... and even sunbeds will be put in place," Butyrka's head Sergei Telyatnikov told state-run radio station Vesti FM.
The sunbeds, which Mr Telyatnikov said would be used for medical purposes, will be installed by the end of the year, the state-run RIA news agency said.
Russia's crowded, poorly managed prison system ...