Head deep underground for this unforgettable 3.5-hour tour of Moscow’s subterranean world. Built by the Soviet Union, Russian’s metro system is perhaps the grandest in the world. Visit some of the city’s most awe-inspiring stations as you ride the tangled web of train lines that sprawl out underneath the capital. Then, wander through the haunting tunnels of a hidden Cold War military bunker before trying traditional Russian pie, bread and, of course, vodka. Numbers limited to 12 on this small-group tour, ensuring a more intimate experience.