Tuol Sleng Genocide Museum - "Skull map"

The buildings at Tuol Sleng are preserved, some rooms as they were left when the Khmer Rouge were driven out in 1979. The regime kept extensive records, including thousands of photographs. Several rooms of the museum are now lined, floor to ceiling, with black and white photographs of some of the estimated 20,000 prisoners who passed through the prison.

The site has four main buildings, known as Building A, B, C, and D. Building A holds the large cells in which the bodies of the last victims were discovered. Building B holds galleries of photographs. Building C holds the rooms sub-divided into small cells for prisoners. Building D holds other memorabilia including instruments of torture.

Rampart: A large earthen mound used to shield the inside of a fortified position from artillery fire and infantry assault. Occasionally ramparts might be constructed of other materials, such as sandbags.

Republican Party: A political party created in the 1850s to prevent the spread of slavery to the territories. Eventually Republicans came to oppose the entire existence of slavery. Abraham Lincoln was the first Republican president. Very few Southerners were Republicans.

Army: The largest organizational group of soldiers, made up of one or more corps. There were 16 Union armies (named after rivers, such as the Army of the Potomac) and 23 Confederate armies (named after states or regions, such as the Army of Northern Virginia). 1 company = 50 to 100 men, 10 companies = 1 regiment, about 4 regiments = 1 brigade, 2 to 5 brigades = 1 division, 2 or more divisions = 1 corps, 1 or more corps = 1 army.

Cavalry: A branch of the military mounted on horseback. Cavalry units in the Civil War could move quickly from place to place or go on scouting expeditions on horseback, but usually fought on foot. Their main job was to gather information about enemy movements. Until the spring of 1863, the Confederate cavalry force was far superior to its Federal counterpart.

Artillery: Cannon or other large caliber firearms; a branch of the army armed with cannon.