Which Istanbul landmark offers famous views over the city and the Golden Horn and originated as a medieval tower?

Which famous Istanbul landmark was originally built as a Byzantine Christian cathedral in the 6th century?

Which famous Istanbul mosque is also commonly known as the Blue Mosque because of the blue İznik tiles decorating its interior?

Which historic palace on Istanbul's European side was the main imperial residence of Ottoman sultans for centuries?

Which Istanbul market is one of the world's oldest and largest covered markets?

It is set between two continents.

For centuries, Istanbul was known as Constantinople. Which empire made the city its capital after conquering it in 1453?

Istanbul is famously located on both sides of which body of water, connecting Europe and Asia?