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* <see name="Hagia Irene" alt="Aya İrini" address="" directions="on the grounds of Topkapı Palace" phone="" email="" fax="" url="" hours="" price="20 TL (as of Oct 2016) or with the Museum Pass">Hagia Irene, which you will notice to your left after entering the outer yard of Topkapı Palace, is one of few Byzantine-era cathedrals which was never converted to a mosque (though not used for religious purposes either during the Ottoman period). Hagia Irene is now (October 2016) open to the public but going through renovation, so there is very little to see and might not be worth it if you don't have the Museum Pass. There are no audio guides or information signs within the building.</see>
* '''Sultanahmet Mosque''' (''Sultanahmet Camii'', aka '''Blue Mosque''') [http://www.sultanahmetcami.org/hakkinda_eg.php], At Meydan Sokak 17, Sultanahmet (by tram: Sultanahmet), +90 212 518-13-19. May-Oct 09:00-21:00, Nov-Apr: 09:00-21:00.
* '''Basilica Cistern''' (''Yerebatan Sarnici''). Yerebatan Cad., Sultanahmet [http://www.yerebatan.com], 09:00-18:30. A giant underground cistern built by Justinian in 532 to provide water to the city in cases of siege. A wooden walkway winds between the pillars, and lights and piped music add to the eerie atmosphere. Bring some type of fish food as you'll see enormous fish swimming below your feet, and throw a coin into the pool to make a wish. The statues of Medussa are impressive. 3 TL for Turkish citizens, 20 TL ( October 2016 -''no concessions. Turkish currency, NO credit cards accepted, NO Museum Pass accepted.'').