Uman

Under Soviet rule the Rosh Hashanah pilgrimage was suppressed and survived only as small, often clandestine journeys. It reopened to foreign pilgrims under glasnost in the late 1980s, before the Soviet Union dissolved in 1991, and has since grown into a gathering of tens of thousands.

Gedaliah Fleer, Against All Odds, on the Soviet-era pilgrimages; 'Rosh Hashanah kibbutz', Wikipedia, on the reopening of 1988–89 and later attendance