Burg Schwarzberg, Medieval castle ruins in Sächsische Schweiz-Osterzgebirge, Germany.

Burg Schwarzberg is a castle ruin located on a rock formation 210 meters (690 feet) high, overlooking where the Schwarzbach and Sebnitz rivers meet. The outer walls, especially on the southern and western sides, reach about 6.5 feet (2 meters) thick and cover a space roughly 260 by 130 feet (80 by 40 meters).

First documented in 1372 as Swarczberg, the castle belonged to the Berka von der Dubá and served to protect a trade route and link their seats of Hohnstein and Wildenstein. After Heinrich von der Dubá moved to Wildenstein following the 1410 inheritance division, Schwarzberg lost importance and was likely abandoned or destroyed in the Hussite Wars. In 1443 it passed to Elector Frederick II of Saxony; a 1456 record lists it among Hohnstein's stone castles, already described as formerly built up.

The nickname 'Goßdorfer Raubschloss' (Goßdorf Robber Castle) recalls the Berka von der Dubá, who turned to robbery in the 1420s, prompting Elector Frederick II's campaign. On 20 February 1475, more than sixty armed robbers from Bohemia spent the night in the Sebnitz valley and likely used the ruin as quarters.

You can reach the ruins via a path on the northwestern side and explore the well-preserved southern and western walls. The location sits on hilly terrain, so visitors should wear sturdy shoes and be prepared for uneven ground.

In 1858, a local landowner chose to add a round tower and other new structures to the medieval ruins. This addition blends the original remains with 19th-century rebuilding, which visitors can still see today.