'The Sunken Palace' is the biggest of the hundreds of underground reservoirs underneath the streets of Istanbul, dating from Byzantine Constantinople.

You can find out about the history of Istanbul with a stop at German Fountain. Stroll along the seaside or visit the stunning cathedral in the area.

Learn about the local history of Istanbul when you spend time at Tomb of Sultan Ahmet I. Add the area's notable monuments or stunning cathedral to your travel plans.

A world famous monument to the ever-changing history of Istanbul, and one of the largest churches in the world.

Find out about the history of Istanbul when you take a trip to Fountain of Sultan Ahmed III. Stroll along the area's seaside or experience its fascinating museums.

Named for its dazzling interior covered in blue tiles, this is a hub of Istanbul's religious life.