What Is Special About the Basilica Cistern?

The Basilica Cistern is special for its 336 marble columns, mysterious Medusa heads, Byzantine engineering and atmospheric underground setting.

The Basilica Cistern is one of the most unusual historical attractions in Istanbul. Hidden beneath the streets of Sultanahmet, it combines Byzantine engineering, ancient marble columns, mysterious Medusa heads and atmospheric water reflections.

Built in the 6th century during the reign of Emperor Justinian I, the Basilica Cistern once supplied water to the Great Palace of Constantinople and nearby buildings.

Quick answer The Basilica Cistern is special because visitors can walk through a 1,500-year-old underground water reservoir supported by 336 columns and decorated with some of Istanbul’s most mysterious ancient sculptures.

Why Is the Basilica Cistern Famous?

The Basilica Cistern is famous for its vast underground chamber and long rows of marble columns. The shallow water beneath the walkways reflects the columns, arches and lighting, making the interior appear larger and more dramatic.

A hidden structure beneath Sultanahmet

336 ancient marble columns

Two mysterious Medusa heads

The decorated Weeping Column

Advanced Byzantine engineering

Water reflections and modern lighting

These elements give the Basilica Cistern a very different atmosphere from Istanbul’s mosques, palaces and open-air monuments.

The 336 Marble Columns

The underground chamber is supported by 336 marble columns arranged in 12 rows. Most of the columns are approximately nine metres high.

Many were reused from older Roman structures. This explains why their colours, surfaces and decorative capitals are not all the same.

Why are the columns different? Byzantine builders often reused stone from older buildings. This practice allowed them to create a strong structure using materials that were already available.

The symmetrical arrangement of the columns is one of the most recognisable views inside the Basilica Cistern.

The Mysterious Medusa Heads

The two Medusa heads are the most famous archaeological details inside the Basilica Cistern. Both are used as stone bases beneath separate columns.

Upside-Down Medusa

One head is placed completely upside down. Its position has inspired stories suggesting that it was turned to remove Medusa’s mythical power.

Sideways Medusa

The second head rests on its side. Its unusual position may simply have helped builders create the correct height for the column above.

Myth or history? The original location of the Medusa stones and the reason for their unusual positions have never been conclusively confirmed.

Their unknown origin and connection with Greek mythology make them some of the most photographed objects in the cistern.

Read more about the Medusa heads inside the Basilica Cistern .

Advanced Byzantine Engineering

The Basilica Cistern was not originally built as a monument. It was an important part of Constantinople’s water supply system.

Water was transported into the city through aqueducts and channels before being stored in the underground reservoir. The cistern then supplied the Great Palace and nearby buildings.

Thick brick walls helped contain the water.
Waterproof mortar reduced leaks.
Columns and arches supported the ceiling.
The underground location reduced evaporation.
The structure protected water from outside damage.
Its design allowed large quantities of water to be stored.

The survival of the structure for almost 1,500 years demonstrates the advanced engineering skills of Byzantine builders.

Learn more about Basilica Cistern architecture .

The Weeping Column

Another distinctive feature is the Weeping Column. Its surface is covered with raised circular, eye-shaped and teardrop-like carvings.

Why does it look wet? The humid underground environment causes moisture to form on the stone, creating the appearance of a column that is crying.

A popular legend claims that the carved tears remember workers who suffered during the construction of the cistern. However, this story is considered local folklore rather than confirmed history.

The column is also known as the Wishing Column because many visitors touch one of its circular patterns and make a wish.

Discover the full story of the Weeping Column in the Basilica Cistern .

A Unique Underground Atmosphere

What makes the Basilica Cistern special is not only its history. The experience of entering the structure is also very different from visiting other attractions in Istanbul.

Visitors descend from the busy streets of Sultanahmet into a quiet underground chamber. Soft lighting, stone arches, shallow water and long rows of columns create a calm and mysterious setting.

The Basilica Cistern is often called the Sunken Palace. It was never a real palace, but its scale and elegant columns give the interior a palace-like appearance.

Contemporary sculptures and temporary artworks also create a contrast between ancient Byzantine architecture and modern art.

What Makes the Basilica Cistern Unique?

It is hidden beneath Istanbul’s historic centre.
It contains 336 ancient marble columns.
Its Medusa heads remain surrounded by mystery.
The Weeping Column has a popular wish-making tradition.
It preserves part of Constantinople’s water system.
Its shallow water creates impressive reflections.
Ancient architecture is combined with contemporary art.
Its underground setting creates a unique atmosphere.

Few places in Istanbul bring together history, mythology, engineering and visual art in the same underground space. This combination makes the Basilica Cistern one of the city’s most distinctive landmarks.