The first four sites in the list above together comprise the Chardham, or four holy pilgrimage destinations. It is believed that travelling to these places leads to moksha, the release from samsara (cycle of rebirths).
Bahá'u'lláh decreed pilgrimage in His Motherbook (Kitáb-i-Aqdas) to two places: the House of Baha'u'llah in Baghdad, Iraq and the House of the Báb in Shiraz, Iran. In two separate Tablets, known as Suriy-i-Hajj, He prescribed specific rites for each of these pilgrimages (lifting the injunction regarding the shaving of one's head for pilgrimage in the Kitáb-i-Aqdas). It is obligatory to make the pilgrimage, "if one can afford it and is able to do so, and if no obstacle stands in one's way". Baha'is are free to choose between the two Houses, as either has been deemed sufficient. And although women are not bound to perform pilgrimage, they are certainly not prohibited to do so.
Later, Abdul'Baha designated the Shrine of Baha'u'llah at Bahji (the Qiblih) as a site of pilgrimage also. No rites have been prescribed for this pilgrimage.