Whilst in Odessa book a tour of Odessa’s catacombs. This maze of 2,500 kilometres with hundreds of entrances, exits, caves, and tunnels, was used to fight the Nazis in World War II. The tour includes walking in underground tunnels, where conditions of a partisan camp are reconstructed. The guides also tell stories of how the catacombs were used as a refuge for slave traders, who smuggled stolen women out of the port of Odessa to the slave markets of Constantinople.