Harcsaszájú Cave, Underground cave system in Budapest, Hungary.
Harcsaszájú Cave is a cave system in Budapest featuring a monumental entrance corridor measuring 5 by 6 meters that slopes steeply inward through passages formed in upper Eocene limestone. The overall structure includes several interconnected sections with varying widths and heights.
The cave was discovered in 1902 and later documented scientifically in 1919, marking the start of systematic exploration. This early documentation sparked growing interest from tourist associations and caving groups that explored the system over decades.
The cave's name comes from its hook-shaped opening that resembles a fish's mouth. Visitors can see this distinctive form right at the entrance when approaching the opening.
The entrance is located near a former quarry site with parking available on-site. The best way to reach it is by taking a bus to Kolosy Square, from where the cave is accessible on foot.
Researchers discovered additional passages in 2008 that extended the known length from 300 meters to 2 to 3 kilometers of interconnected tunnels. These later findings revealed the cave was far larger than initially believed.
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