In the cellar of a building in central Tallinn hides a tiny, cavern-like nightclub that was for decades a gathering place for Estonia’s artists, intellectuals, and activists. Its patrons and staff also played a role in the cultural uprising that led to the country winning its independence from the Soviet Union. The KuKu Club (KuKu Klubi) was established in 1935 in the basement of the Tallinn Art Hall, built by the local arts community to house galleries and studios for the city’s creatives. Formally called the Imaginative Arts Club, or…