Across the tram lines from Haghia Sophia lies the entrance to one of Istanbul's more unusual historic sights - the Yerebatan Sarayı (Underground Palace). This amazing construction is actually an underground cistern, one of many that once stored Constantinople's water supply.
Across the tram lines from Haghia Sophia lies the entrance to one of Istanbul's more unusual historic sights - the Yerebatan Sarayi.