
Fort Oelegem is a 115-year-old military fortress located in Oelegem, Belgium, featuring well-preserved period structures including soldiers' quarters, ammunition rooms, cannon chambers, kitchen, and troop rooms with a bomb lift beneath a howitzer tower. The site functions as a dual historical and nature destination, operating as a unique bat reserve where hundreds overwinter in ideal conditions, requiring the fort to close October through April to protect hibernating colonies. Visitors enjoy guided one-hour tours through the fort's interior chambers accessible via central corridors and internal stairs leading to rooftop views, complemented by nature trails across the fort island with QR-coded information points about local wildlife. The site operates mid-April through mid-October; visitors should bring warm clothing as interior temperatures remain around 10°C and the tour involves stairs and uneven surfaces.