Cobh has played a large part in the emigration of our ancestors. Originally known as Cove (the Cove of Cork), it was renamed Queenstown in 1849 in honor of the visit of Queen Victoria, and then changed after Irish Independece back into the Irish version, Cobh (pronounced Cove). Built into the side of a hill, from the docks the town rises steeply with the Cathedral Church of St. Colman sitting at the top. St. Colman's was started in 1868 and completed in 1919 and contains the largest carillon in Ireland.
The railway station houses the Queenstown Story Heritage Centre, an exhibit that tells the emigration and famine story. Outside stands the statute of Annie Moore and her brothers, the first person to be processed through the new Ellis Island Immigration Station on 1 January 1892 in New York. The matching statue stands at Ellis Island.
Besides emigration and famine, Cobh is also know as the last port of call of the Titanic and the place where both the dead and survivors of the Lusitania were brought. There are memorials and museums around the town that tell these stories as well.
If you are traveling in the south of Ireland, I'd strongly recommend a visit to Cobh.