In Hyderabad, a 184-carat diamond found inside an old shoe was used for decades as a simple desk paperweight. But unimaginable wealth is just one of the city's mind-blowing secrets.
Here are three of the most remarkable facts about the city:
The Acoustic Security System of Golconda Fort
Long before electronic surveillance, the architects of Golconda Fort designed a warning system entirely out of sound. At the entrance gate, known as the Bala Hissar pavilion, clapping your hands beneath a specific dome creates a sharp echo. Through a complex series of arches and acoustic engineering, that exact sound travels clearly to the highest point of the citadel—the Bala Hissar Baradari—almost a kilometer away. Guards used this phenomenon to instantly signal the approach of royalty or the arrival of enemy forces, relying on the physics of sound to protect the fortress.
A 184-Carat Paperweight
For centuries, the Golconda mines surrounding Hyderabad were the world’s only source of diamonds, producing legendary stones like the Hope Diamond and the Koh-i-Noor. This monopoly generated immense wealth for the city's rulers, the Nizams. Mir Osman Ali Khan, the seventh and last Nizam, was so wealthy he appeared on the cover of TIME magazine in 1937 as the richest man in the world. Despite his vast fortunes, he was famously eccentric. The 184.75-carat Jacob Diamond—the fifth-largest polished diamond in the world—was the very stone he discovered in his father's shoe and relegated to paperweight duties.
The Sunken Monolith of Hussain Sagar
In the center of Hussain Sagar, a heart-shaped lake separating Hyderabad from Secunderabad, stands an 18-meter-tall statue of Gautama Buddha. Weighing 580 tons, it is the world’s tallest monolithic Buddha, carved entirely from a single piece of white granite. The remarkable part is not just its size, but how it got there. In 1990, during its transport to the island pedestal, the massive barge carrying the statue capsized. The monolith sank to the bottom of the lake, killing eight workers. It remained underwater for two years until an unprecedented salvage operation raised the 580-ton rock from the mud and successfully installed it on its plinth, where it remains today.