I am a historic fortification that stands guard over the city of Istanbul, once the capital of two empires. What am I?

Category: Geography · Difficulty: hard

Hint: I have served both as a church and a mosque.

Answer

Topkapi Palace

Explanation

The Hagia Sophia is a historic architectural marvel in Istanbul, originally built as a cathedral, later serving as a mosque.

This is a hard geography riddle — a tricky one that takes a little thought. The answer is Topkapi Palace.

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