A 46-meter tower struck by lightning for 900 years without collapse. Engineering analysis shows the brick bonding pattern creates natural electrical grounding.
Petar Milošević, CC BY-SA 4.0, via Wikimedia Commons
An Accidental Lightning Rod
The Kalon Minaret, a 45.6-meter-tall baked brick tower, has dominated Bukhara's skyline since its construction in 1127. For over 900 years, it has survived earthquakes, wars, and countless lightning strikes. Its resilience is not accidental but a result of medieval engineering that created a surprisingly effective system for dissipating electrical energy. The tower’s deep foundation, specific mortar composition, and complex brickwork combine to be a massive, distributed lightning rod.
The minaret's foundation extends more than 10 meters below ground, laid on a base of reeds to provide earthquake-proofing. The architect, Usto Bako, used a mortar of clay, gypsum, and vegetable ash, which over centuries has fused with the high-quality fired bricks into a monolithic mass. This solid, deep structure provides a direct and substantial path for electrical current to travel from the sky into the earth, dissipating the immense energy of a lightning strike without causing structural failure. The entire tower, with its moisture-retaining porous bricks, effectively becomes a conductor.
Engineered Resilience in Brick
The exterior of the Kalon Minaret features 14 decorative bands, each with a unique geometric pattern created by the skillful arrangement of bricks. These patterns are functional. The alternating courses of bricks laid lengthwise (stretchers) and width-wise (headers), similar to historical English or Flemish bonds, create a complex, interlocking structural system. This method of construction provides immense strength and stability.
From an electrical perspective, this complex brickwork offers countless parallel paths for lightning's current to follow. Unlike a modern lightning rod, which concentrates the discharge along a single metal strip, the minaret distributes the energy over its vast surface area. The current flows through the network of bricks and mortar joints to the ground. This diffusion prevents the explosive heating and mechanical stress that would occur if the energy were channeled through a narrow path, which could otherwise shatter the masonry. This design, intended for seismic and structural stability inadvertently gave the minaret its remarkable ability to survive centuries of electrical storms. Even when damaged by artillery in 1920, the core structure remained intact and was later repaired.
💡Fun Facts
The name "Kalon" means "Great" in the Tajik language.
When Genghis Khan's forces destroyed most of Bukhara in 1220, he was so impressed by the minaret's height and beauty that he ordered it to be spared.
For centuries, it was used for public executions, earning the grim nickname "Tower of Death."
The architect, Usto Bako, had his name inscribed on one of the decorative bands near the top, a rare honor at the time.
The Poi Kalon complex is generally accessible 24/7, but the mosque has specific prayer times. Visit early morning or late afternoon to avoid crowds.
Admission
Access to the main square is free. Climbing the minaret is often restricted, but access may be possible through the Kalon Mosque for a fee.
Accessibility
The area around the minaret is a large, flat, paved square, making it accessible for wheelchairs and strollers. The minaret itself is only accessible via a narrow, steep spiral staircase with 105 steps.
Bukhara Kalon Minaret Lightning SurvivalBukhara Region, Uzbekistan
