A marvel of Byzantine engineering under the streets of Istanbul.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

This family-owned canteen has been selling goat milk ice cream since 1933.