The Kaaba is a small construction vested inboard the garth of al-Haram Mosque in Mecca, Saudi Arabia.
The Kaaba is the holiest site in Islam; the Haram Mosque was built around it and because of it.
The qibla, the quarter Muslims portrait during praying, is the direction facing the Ka'ba.
The Ka'ba houses the mysterious Black Stone, which was revered in Mecca in pre-Islamic times as well.
It became a Muslim relic in the time of the Prophet Muhammad and traveler to Mecca try to stop and kiss it while outflank the Ka'ba during the hajj.