mu·se·um noun \myu̇-ˈzē-əm\ : a building in which interesting and valuable things (such as paintings and sculptures or scientific or historical objects) are collected and shown to the public
count·down noun \ˈkau̇nt-ˌdau̇n\ : the act of counting down the number of seconds that remain before something (such as the launch of a rocket) happens : the period of time before an important or special event