The Binbirdirek Cistern (Turkish: Binbirdirek Sarnıcı, also known as the Cistern of Philoxenos), located in Istanbul’s historic Sultanahmet district, is the city’s second-largest covered Byzantine cistern after the Basilica Cistern.
This subterranean reservoir, part of the UNESCO World Heritage Site “Historic Areas of Istanbul” (inscribed 1985), once stored up to 40,000 cubic meters of water supplied by the Aqueduct of Valens, serving public and imperial needs during Constantinople’s peak.
With its 224 marble columns (earning the poetic name “Thousand and One Columns”), it offers a quieter, less crowded alternative to the more famous Basilica Cistern, blending atmospheric beauty with profound historical depth.
Historical Significance
Likely built in the 4th century by Roman senator Philoxenos under Emperor Constantine I, or expanded in the 5th–6th century during Justinian I’s reign, it functioned as a castellum divisorium—a distribution point for water from the Aqueduct of Valens ...
The Blue Mosque, officially the Sultan Ahmed Mosque (Turkish: Sultan Ahmet Camii), is an iconic 17th-century Ottoman mosque in Istanbul’s Sultanahmet district. Renowned for its stunning blue Iznik tiles and six slender minarets, it’s a UNESCO World Heritage site within Istanbul’s Historic Areas.
It remains an active mosque, drawing worshippers and tourists for its architectural grandeur and historical significance.
Commissioned by Sultan Ahmed I (1603–1617), it was built between 1609 and 1616 by architect Sedefkâr Mehmed Ağa, a student of Mimar Sinan. Intended to rival Hagia Sophia (directly opposite), it symbolized Ottoman power and piety after military setbacks.
The mosque sparked controversy for its six minarets, equaling Mecca’s Masjid al-Haram, resolved by adding a seventh minaret to Mecca.
Completed just before Ahmed I’s death at age 27, it has since been a centerpiece of Istanbul’s skyline. Restorations in the 19th and 21st centuries preserved its ornate interiors.
The mosque ...
The Aqueduct of Valens (Turkish: Valens Su Kemeri or Bozdoğan Kemeri, meaning “Aqueduct of the Grey Falcon”) is a remarkable Roman engineering feat and one of Istanbul’s most iconic ancient landmarks.
Built in the 4th century AD, it formed a key part of a vast water supply system that sustained Constantinople (modern-day Istanbul) for over a millennium. Spanning a valley in the city’s historic peninsula, it exemplifies Roman hydraulic ingenuity, with its robust limestone arches still standing tall amid urban bustle.
Construction began under Emperor Constantius II around 345 AD, but it was completed in 373 AD by Emperor Valens, after whom it is named. This was just five years before Valens’ defeat at the Battle of Adrianople in 378 AD, which exposed Thrace to invasions. The aqueduct addressed the growing water demands of Constantinople, founded by Constantine the Great in 330 AD, which had outgrown earlier systems from the Hadrian era (117–138 AD).
The full system stretched up to 268 ...
The Şehzade Mosque (Turkish: Şehzade Camii), located in Istanbul’s Fatih district, is a significant Ottoman mosque within the UNESCO World Heritage Site “Historic Areas of Istanbul” (inscribed 1985).
Commissioned by Sultan Süleyman the Magnificent in memory of his son Şehzade Mehmed, who died in 1543 at age 22, it was built between 1543 and 1548 by the renowned architect Mimar Sinan.
Known as Sinan’s “apprentice work,” it marks an early milestone in his career, preceding his masterpieces like the Süleymaniye Mosque.
Built during the Ottoman Empire’s golden age, the mosque reflects Süleyman’s grief for his son and his ambition to cement the dynasty’s legacy. It was Sinan’s first major imperial commission, showcasing his emerging genius.
• Role: As part of a külliye (complex) with a madrasa, hospice, and Mehmed’s tomb, it served religious, educational, and charitable functions, typical of Ottoman social structures.
• UNESCO Status: Recognized for its role in ...