The dome that house Dhyanalinga at isha yoga center is very unique in its nature, It is an elliptical dome made of 250,000 bricks and weighs about 700 tons stands without a single pillar of support , It is made up of only bricks & mud mortar and no cement, no steel, and no concrete have been used in its making. The nature of this design ensures a lifespan of Dhyanlinga dome of at least 5000 years for the dome.
source
