“Just crowds of tourists.” I was told. “Needs about 20 minutes.” The Family reported being told. “The sense of the sacred has long fled this place.” A famous travel writer would be the first to know. Take the advise, and don’t spend the couple of hours inside that we did. All you will get is a view from the inside of an engineering marvel from 537 CE, which was the center of the Christian church for a thousand years, before it became an Ottoman mosque in 1453, and eventually, in 1935, a museum.
Instead, take up position between the Sultan Ahmet Mosque and the Hagia Sofia, and take a photo. Pay special attention to the 32 meter main dome, it was designed by Anthemius of Trelles and Isidorus of Miletus. You don’t really need to know that the dome was too grand for its time, and that it collapsed in an earthquake in 558 CE, was rebuilt in 562, collapsed again twice, and was eventually rebuilt on a smaller and more manageable scale in the 14th century CE. Ignore the fact that the present structure was sacked several times before the arrival of the Turks: once by Vikings in the 8th century, and more famously by the Fourth Crusade in 1204 CE. Definitely ignore the minarets; they were added by the Turks (the two that you see on the left in the featured photo were designed by Mimar Sinan, an architectural genius in the time of Suleyman the Magnificent, and the red brick one on the right is the oldest, possibly from the 15th century).
If you really have an urge to go in then briefly take up a position in front of the central door. You have a clear view of two mosaics, one of Christ Pantocrator in the narthex, and the other of the Madonna over the altar. The mosaic of the Pantocrator stands above the 7 meters high Emperor Door, with a bronze frame and wood said to have been salvaged from Noah’s Ark (oh how I Want to Believe), so this is a great place to stand. Another advantage is that you will hear every language in the world as people stream past you.