Old Hansen Planetarium, Salt Lake City

Originally built in 1904 as the Salt Lake City Public Library, this landmark was renovated in the 1960s to become the Hansen Planetarium – the go-to place for all things space. During its operation, it attracted 20% of the city's population and had the highest per capita attendance of any planetarium in the nation. The operation continued until April 2003, when it outgrew the building and was replaced by the Clark Planetarium in The Gateway. Since that time, it was remodeled into the O.C. Tanner Company Flagship jewelry store, which opened in 2009.

While still in the construction stage, the building was described as a "combination of the Doric and Ionian styles of architecture", and would later be classified in the Beaux Arts style. Only three of the four walls—the sides and front—were preserved in the 21st-century restoration, and you may notice that the rear wall now consists of glass and stone, both etched with images of the building's history. It's the largest laser stone-carving project in the world with 18 panels covering 900 square feet (84 square meters) and weighing 44,000 pounds (20,000 kilograms) in all. While the bottom of the rear wall contains repeated images from the library in 1905, the top contains images of a galaxy (signifying the Hansen Planetarium), and the middle contains an image of the founder of the company, O.C. Tanner.

Inside, a new limestone spiral staircase was built with a Flora Cascade chandelier hanging in the center of the spiral. The chandelier includes about 4,000 strands of fiber optics, more than 14,000 interwoven shapes made of white polymer and steel, and about 3,000 golden and amber glass leaves. Weighing 243 pounds (110 kilograms) and extending 26.4 feet (8.0 meters) from the ceiling, the chandelier stretches nearly the entire height of the building.