Scientists Discovered World’s Largest Spider Web, Home to more than 100,000 Spiders

A man’s curious mind thrives on discovery. An amazing discovery has shown the world the unbelievable. In a sulfur-rich Romanian cave, a group of scientists in Romania have found a hidden house of 100,000 spiders. Scientists believe it is the world’s largest spider web. This discovery has created a history.

Recent reports suggest that there are two rival species that are living together peacefully. This discovery was published in the journal Subterranean Biology. According to LiveScience, which initially published the discovery, it spanned the walls of a narrow, low-roofed tunnel located in a persistently dark area deep within a sulfur-rich cave, near the entrance of the cavern.

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The web is housed in a cave that is 1,140 feet above sea level, near the boundary between Greece and Albania. This colony of spiders is huge, and a video is going viral on X, showing a man who is examining the cave and the web, literally touching the grey gossamer curtains like material has formed due to giant interconnected funnel webs. It is clinging to the cave wall.

Scientists discovered the world’s largest spiderweb, covering 106 m² in a sulfur cave on the Albania-Greece border. Over 111,000 spiders from two normally rival species live together in a unique, self-sustaining ecosystem—a first of its kind.pic.twitter.com/LPLKVElSNv — Massimo (@Rainmaker1973) November 6, 2025

According to recent media reports, in this big spider city, there are two spider species living. One is the barn funnel weaver, also known as the domestic house spider, and the second is the sheet, also called the dwarf weaver.

The researchers used a food web-mapping technique known as stable isotope analysis to determine that the underground spider colony preyed on tiny midges that ate sulfur-eating bacteria that flourished in the cave environment, according to the New York Post.