looks onto an artificial grotto. Built between 1879 and 1881, the Summerhouse was intended to answer complaints that visitors to the Capitol had no place to sit and no place to obtain water for their horses and themselves. Modern drinking fountains have since replaced Olmsted's fountain for the latter purpose. Olmsted intended to build a second, matching Summerhouse on the southern side of the Capitol, but congressional objections led to the project's cancellation. Flags Up to four U.S. flags can be seen flying over the Capitol. Two flagpoles are located at the base of the dome on the East and West sides. These flagpoles have flown the flag day and night since World War I. The other two flagpoles are above the North (Senate) and South (House of Representatives) wings of the building, and fly only when the chamber below is in session. The flag above the House of Representatives is raised and lowered by House pages. The flag above the United States Senate is raised and lowered by Senate Doorkeepers. To raise the flag, Doorkeepers access the roof of the Capitol from the Senate Sergeant at Arms's office. Several auxiliary flagpoles, to the west of the dome and not visible from the ground, are used to meet congressional requests for flags flown over the Capitol. Constituents pay for U.S. flags flown over the Capitol to commemorate a variety of events such as the death of a veteran family member. Major events The Capitol, as well as the grounds of Capitol Hill, have played host to major events, including presidential inaugurations held every four years. During an inauguration, the front of the Capitol is outfitted with a platform and a grand staircase. Annual events at the Capitol include Independence Day celebrations, and the National Memorial Day Concert. The general public has paid respect to a number of individuals lying in state at the Capitol, including numerous former presidents, senators, and other officials. Other Americans lying in honor include Officers Jacob Chestnut and John Gibson, the two officers killed in the 1998 shooting incident. Chestnut was the first African American ever to lie in honor in the Capitol. The public also paid respect to Rosa Parks, an icon of the civil rights movement, at the Capitol in 2005. She was the first woman and second African American to lie in honor in the Capitol. In February 2018, the evangelical Rev. Billy