Built in 1908, Colorado’s State Capitol Building is best known for its brilliant dome, which is covered with 200 ounces of 24K gold leaf. However, the really priceless material is the Colorado onyx that was used inside as wainscoting. The entire world’s supply of this unusual rose-colored stone was used in the building and no more of it has ever been found. Free tours of the Capitol offer a visit to the Senate and House of Representative chambers.
Another highpoint of the tour is the step on the west staircase that is exactly “one mile above sea level.” The marker was carved into the steps in 1947, but in 1967 some students discovered that the measurement was wrong and a geodetic survey marker was placed in the correct spot, three steps above the original marker.