Islam is the primary religion of
Turkey and numerous mosques are
located throughout Istanbul.
Perhaps the most well known is the
Mosque of the Sultan Ahmet, more
commonly known as the Blue
Mosque
. It was designed in the 17th
century.

This building is called the Blue Mosque because the inside is
decorated with over 20,000 blue ceramic tiles. Its main dome is
about 70 feet in diameter and 140 feet high.