What is the composition of the columns in the Crypt?

The columns in the Crypt are indeed made of brown stone, which contributes to the distinct architectural style of the space. The choice of material not only offers aesthetic appeal but also adds to the overall stability and durability of the structure. Brown stone is typically chosen for its warm color and texture, which can evoke a sense of solemnity and reverence appropriate for such a significant historical site.

The other materials listed do not accurately represent the actual columns found in the Crypt. White marble and gray granite are often associated with different structures in the Capitol, showcasing qualities like elegance and resilience. Red brick, on the other hand, is more commonly used in various types of architecture but does not align with the design of the Crypt's columns.