Irish Struggles: The Great Hunger

Series historical adviser Daniel Czitrom offers a closer look at the Irish potato famine that brought characters Maguire and O'Brien to Five Points.

Unearthed Civil War Letters: Brendan Donovan

Curious about Irish immigrant and Boss Tweed's trusted lieutenant, General Brendan Donovan? Read Donovan's correspondence with a friend, written during his tour as a brigadier general in the Union Army.

The 1864 Plot To Burn Down New York City

Last night's season finale was literally fiery: The Confederates' plot to destroy New York City by setting a series of blazes in various hotels and venues was set in motion on November 25, the day after Thanksgiving. Find out how the terrorist plot was extinguished.