Gurdwara Lal Khoohi, alternatively Gurdwara Lal Khooh or Lal Khoo, literally Gurdwara Well of Blood was a historical Gurdwara (Sikh Place of Worship) located in Lahore, in what is now Pakistan. It was built at the site where the fifth Sikh Guru, Guru Arjan Dev, was incarcerated during the reign of the Mughal Emperor, Jehangir.
It has since been converted into a Muslim shrine, 'Haq Char Yaar'.
References
Gurdwara Lal Khoohi Wikipedia(Text) CC BY-SA