What unique feature is found incorporated into the exterior walls of the Tribune Tower?

The Tribune Tower is renowned for its distinctive incorporation of artifacts from significant global structures into its exterior walls. This unique feature demonstrates the building's connection to a wider architectural heritage and embodies the spirit of journalism, reflecting the motto "The Truth," as the tower was designed as the headquarters for the Chicago Tribune newspaper. Throughout its facade, you can find pieces from famous landmarks such as the Parthenon, the Great Wall of China, and the Taj Mahal, among others. This eclectic mix of materials not only enhances the building's aesthetic appeal but also serves to tell a story about the world's architectural achievements and the reach of the newspaper's influence.

The other options, while they represent interesting architectural and cultural elements, do not specifically describe the Tribune Tower's defining characteristic of featuring global artifacts embedded within its walls.