Feature of the Capitol or the Taj Mahal Crossword Clue

 The feature of the Capitol or the Taj Mahal is a DOME.

Both the Capitol Building in Washington, D.C. and the Taj Mahal in Agra, India have large, iconic domes. Domes are a common architectural feature of many important buildings around the world, and they are often used to symbolize power, authority, and grandeur.

The Capitol Building's dome is made of cast iron and weighs over 4 million pounds. It is the largest unsupported cast iron dome in the world. The Taj Mahal's dome is made of white marble and is over 213 feet tall. It is one of the most iconic domes in the world.

Domes are not only beautiful, but they are also functional. They can help to reduce noise and heat inside a building, and they can also improve ventilation.

I hope this helps!