Bahá'í pilgrimage today means nine days at the World Centre in Haifa and Akká in Israel: the Shrine of the Báb on the slope of Mount Carmel with its nineteen terraces, the Shrine of Bahá'u'lláh at Bahjí outside Akká, the prison cell in the citadel where Bahá'u'lláh was held, the houses of the exile, the gardens, and the International Archives, where the photograph of Bahá'u'lláh is shown. Places are limited and applicants wait years. The pilgrimage prescribed in the Kitáb-i-Aqdas is a different thing — to the House of Bahá'u'lláh in Baghdad and the House of the Báb in Shiraz, obligatory on men who can afford it — and both buildings have been destroyed: the House of the Báb was demolished after the Iranian revolution in 1979 and the site paved, and the Baghdad house was demolished in 2013. The Bahá'í World Centre's location in Israel is an accident of Ottoman penal geography — Bahá'u'lláh was exiled to Akká in 1868 because it was the empire's worst prison — and Bahá'ís are careful to say so, since it is regularly misread as a political affiliation.