Church of Saint Nicholas, Church ruins in Třídomí, Czech Republic.

The Church of Saint Nicholas is a ruined stone church on a low rocky outcrop at the northern foot of Krudum in the Slavkov Forest. Its nave measured 14.8 m by 12.8 m, enclosed by walls 1.15 m thick; parts of the masonry were rebuilt after excavations between 2002 and 2006.

First documented in 1246 or 1253, when King Wenceslas I gave the church of St. Nicholas to the Knights of the Red Star. It disappeared around 1500, absent from the Loket register of 1525. Rediscovered in 2002, its walls were partly rebuilt.

The remaining walls of St. Nicholas Church serve as a memorial to the architectural and religious heritage of the Třídomí region.

The ruins lie in the forest on a low rocky outcrop at the foot of Krudum, six kilometres west of Horní Slavkov between Hrušková and Třídomí. Reach them on foot; the ground is uneven and partly overgrown. Parts of the walls were rebuilt after the 2002–2006 excavations.

The stone remnants maintain their original spatial arrangement, allowing visitors to understand the former layout of this religious building.