Once the imperial residence of the Ottoman sultans, Topkapı Palace is one of the most important historical sites in Istanbul. Built by Mehmed the Conqueror, it served as the center of Ottoman rule for centuries. The palace houses sacred relics, including items belonging to Prophet Muhammad (PBUH), along with breathtaking courtyards, lavish chambers, and intricate tile work. It offers a glimpse into the grandeur and complexity of Ottoman governance, culture, and Islamic history.