1555 SAUDI ARABIA - Al-Masjid an-Nabawi in Medina

Established and originally built by the Islamic prophet Muhammad, and for this reason named the Prophet's Mosque, Al-Masjid an-Nabaw is the second mosque built in the history of Islam and is now one of the largest in the world. It is the second-holiest site in Islam, after al-Masjid al-Haram in Mecca. The site was originally adjacent to Muhammad's house; he settled there after his Hijra to Medina in 622 CE, and shared in the heavy work of construction. The mosque also served as a community center, a court, and a religious school. There was a raised platform for the people who taught the Quran. Subsequent Islamic rulers greatly expanded and decorated it. In 1909, it became the first place in the Arabian Peninsula to be provided with electrical lights.

1108 SAUDI ARABIA (Makkah) - King Fahd's Fountain and Water Tower in Jeddah

Jeddah is the largest sea port on the Red Sea, and the second-largest city in Saudi Arabia after Riyadh, with a population of 5.1 million. It is also the principal gateway to Mecca (Islam's holiest city, which able-bodied Muslims are required to visit at least once in their lifetime), and a gateway to Medina (the second holiest place in Islam). Probably the main landmark of the city is King Fahd's Fountain, built in the 1980s and listed by the Guinness World Records organization as the highest water jet in the world at 312m. The fountain was donated to the City of Jeddah by the late King Fahd bin Abdul Aziz, after whom it was named.