Events with tag - Underground

January 1, 1136

Wieliczka Salt Mine

The Wieliczka Salt Mine, inscribed on the UNESCO World Heritage List, is a unique mining monument with documented history dating back to the 12th century. The first mentions of salt extraction come from a papal bull of 1136, and the site has transformed from a medieval mining center into a world-class tourist attraction.

January 1, 1830

Mississippi River Underground Railroad

The Mississippi River served as a crucial pathway in the Underground Railroad network from 1830 to 1863, marking the boundary between slave states and free territories. This waterway facilitated thousands of escape attempts through an intricate system of safe houses, crossing points, and brave conductors.

December 1, 1850

Harriet Tubman's First Underground Railroad Mission

In December 1850, Harriet Tubman conducted her first Underground Railroad rescue mission, successfully freeing her niece Kessiah Bowley and her two children from slavery in Maryland. This mission marked the beginning of her legendary career as a conductor on the Underground Railroad.

September 27, 1939

Polish Underground State

The Polish Underground State was established on September 27, 1939, as a secret administrative and military structure in response to the German and Soviet occupation of Poland. It was a unique phenomenon in Europe, encompassing both civilian and military structures that operated in conspiracy throughout World War II.

November 13, 1939

Establishment of the Union of Armed Struggle

The Union of Armed Struggle (ZWZ) was established on November 13, 1939, by order of Gen. Władysław Sikorski as the main underground organization in occupied Poland. ZWZ was formed to replace the Service for Poland's Victory and operated until its transformation into the Home Army in 1942. This organization became the foundation of the Polish Underground State during World War II.