Fekete Cave, or the Black Cave, is one of Hungary's deepest and most impressive caves, hidden on the Nagy-fennsík plateau in the Bükk Mountains. This is a destination for serious vertical caving enthusiasts rather than casual hikers — a true underground adventure awaits those prepared for it.

The entrance opens in a seasonally active sinkhole at the southern end of the Tekenősi valley, reached along a mostly dry streambed. The cave formed in dark grey, almost black dolomite and limestone, which gave it its name. Inside, a staircase-like sequence of shafts descends through short steep streambed sections, chambers of various sizes, and clayey crawlways. Its largest chamber, Magyar Carlista, rises about 20 meters high. The upper passages are richly decorated with stalactites, stalagmites, columns, and even rare helictites, while the main passage stays rugged and rocky. After heavy rain the cave becomes hazardous, as inflowing water can reach 500 liters per minute and flood nearly the entire system, so timing and conditions matter greatly.

• Tekenősi-rét meadow — continue along a forestry track (on foot or by off-road vehicle), demanding terrain, access requires proper preparation
• The cave entrance lies roughly 60–85 meters from the Tekenős-zsomboly shaft opening

• The cave is strictly protected and can only be visited with permission from the Bükk National Park Directorate
• Rope techniques, good physical fitness, and climbing skills are required
• The first 12 meters is a vertical entrance shaft with built-in metal ladders in a concrete structure
• The cave is prone to flooding — after heavy rain, inflow can reach 500 liters per minute, making most passages impassable
• Several strictly protected bat species live in the cave

Because access is so demanding, few people visit, which means most of the cave's delicate formations remain untouched — a real reward for those who make the underground journey.