Excerpts from Books and Wikipedia
"The Garden of Ridván (literally garden of paradise) or Najibiyyih Garden was a wooded garden in what is now Baghdad's Rusafa District, on the banks of the Tigris river. It is notable as the location where Bahá'u'lláh, founder of the Bahá'í Faith, stayed for twelve days from April 21 to May 2, 1863, after the Ottoman Empire exiled him from Baghdad and before commencing his journey to Constantinople. During his stay in this garden, Bahá'u'lláh announced to his followers that he was the messianic figure of He whom God shall make manifest, whose coming had been foretold by the Báb. These events are celebrated annually during the Festival of Ridván." [Wikipedia]