With construction of the Church Office Building to the north, the Church Administration Building was freed up for offices exclusively for general authorities, and it continues to serve as the church's headquarters. The Church Administration Building furnishes offices for the president of the LDS Church, as well as for his counselors in the First Presidency, the Quorum of the Twelve Apostles, and other general authorities, along with their staff. The building is overseen by the Church Security Department; only certain employees, church officers and their guests are permitted to enter. A variety of events have been held at the CAB, as well as receiving distinguished visitors. As part of the festivities for the 2002 Winter Olympics in Salt Lake City, the Olympic torch was passed through the hands of members of the First Presidency and the Quorum of the Twelve Apostles on the steps of the CAB. It is also a tradition that funeral processions of past LDS Church presidents pass in front of the Church Administration Building. The building has hosted visitors including Michelle Obama and George W. Bush.  Constructed between 1914 and 1917, the building is built of quartz monzonite from the same quarry in Little Cottonwood Canyon as the stone used for the Utah State Capitol and the nearby Salt Lake Temple. The Mt. Nebo Marble Company supplied marble and travertine for the interior of the CAB. According to the Utah Geological Survey, "the company quarried Birdseye marble in the Thistle area of Utah County, and travertine and onyx at Pelican Point near Utah Lake in Utah County and in the Cedar Mountains of Tooele County." Twenty-four ionic columns form a colonnade around the structure, each weighing eight tons. The building's exterior is constructed from 4,517 granite blocks.       .at  .at is the Internet country code top-level domain (ccTLD) for Austria. It is administered by nic.at. The .at top-level domain has a number of second-level domains:   However, it is also possible to register directly at the top level. Given the number of English words that end with -at, this presents the possibility for many domain hacks. Many Austrian domain names were registered for English words that end with "at". Domain hacks treating "at" as a word in its own right (such as "arrive.at") are widespread. As of today, there are very few such domain names left available on the domain prime market as the result of the domain name speculation. Most of them can be bought on the domain secondary market.