Szilváskő is a small but geologically fascinating peak in northern Hungary, near Salgótarján, right by the Slovak border. It's a witness mountain formed by basaltic volcanic activity — technically a filled fissure or crater that survived while surrounding rock eroded away.

At just 625-626 meters, this hill packs an outsized geological punch. It lies within the Karancs-Medves Landscape Protection Area, and a 2-kilometer educational trail winds through it, showcasing the region's volcanic heritage. Along the way you'll spot coal seams from the Nógrád Coal Basin, trench-like collapse features from old mining tunnels, perpendicular basalt columns formed from cooling lava flows, and the remains of the central volcanic vent with its striking 20-25 meter basalt pillars. The atmosphere shifts with the seasons — cool, shaded fissures keep their character even in high summer, while the surrounding volcanic terrain gives the whole area a rugged, otherworldly feel.

How to reach the summit

• Salgótarján — via the educational trail, approx. 1-1.5 hours, easy difficulty

Practical information

• Information panels along the trail explain the site's volcanic and mining geology
• The rock fissures have their own microclimate — firn (old compacted snow) can sometimes still be found there even at the end of summer

A fun fact for geology lovers: cracks left behind by old coal mining opened up rare 'consequence caves' here, making Szilváskő a small but genuine open-air geology museum.