Bologa Castle, Castle ruin in Bologa, Cluj County, Romania

Bologa is a ruined stone fortress on the left bank of the Henț river, opposite the site of the Roman castrum Resculum. Its surviving walls enclose a long, narrow courtyard about 80 m by 20 m, entered through a gate that was once protected by a drawbridge and opened onto a large round bastion. The round keep still stands, but the tower lost its roof in the mid-20th century, so only stone remains.

The castle was founded in the 13th century when Transylvania was under contested rule. In the 17th century, it received reinforced fortifications to defend against growing Ottoman threats to the region.

The castle displays building styles from different periods, visible in how successive generations modified its walls and rooms. These layers show how people adapted the space to their needs across centuries.

The castle stands in the village of Bologa, Cluj County, and can be reached easily by car or train. It is open to visitors free of charge. A major renovation began in 2018 with European Union funding. The site is a ruin, so expect uneven ground and stone surfaces.

Beneath the castle runs a network of tunnels connecting different areas of the site. Some of these passages were carved directly into the bedrock and likely served as escape routes or supply passages.