The castle was abandoned during the 15th century and never rebuilt, leaving only foundation masonry and scattered stone debris.
The peak is composed of phonolite, a volcanic rock that rings when struck, which influenced local geological study.
Remnants of the original dry moat are still visible on the western approach to the summit.
Historical records indicate the site was strategically positioned to monitor the trade routes near the town of Lovosice.
The site remains largely unrestored, preserving its ruinous state rather than being reconstructed as a tourist monument.
Ostrý is a prominent volcanic peak located in the Central Bohemian Uplands, rising to an elevation of 553 meters above sea level. The site features the sparse ruins of Ostrý Castle, a late medieval fortification established in the 14th century by the Kaplíř of Sulevice family. Archaeological excavations have identified defensive walls, a bergfried, and a residential palace within the small castle footprint. The terrain is characterized by phonolite rock formations that provide a stark contrast to the surrounding forested slopes. It is situated within the České středohoří Protected Landscape Area, which mandates specific conservation practices for visitors. The site serves primarily as a hiking destination due to the panoramic views of the Labe river valley and neighboring volcanic peaks.
The highest point of the remaining stone ruins looking toward the Milešovka peak.
Wear sturdy, high-traction hiking boots, as the path to the summit involves steep, uneven, and rocky terrain.
Carry sufficient water as there are no amenities or sources of refreshment on the mountain.
Use trekking poles if you are prone to joint strain, particularly during the descent on loose scree.
Attempting to climb the site in wet or icy weather when the volcanic rock surfaces become dangerously slippery.
Stay on marked trails to protect the fragile volcanic soil and local flora; do not disturb masonry ruins.
