This spider web is noteworthy less for its beauty and more for its scary size. The communal web, draped over multiple trees, was collectively spun in Lake Tawakoni, Texas, in 2007. Spiders typically like to work alone, making this incredible feat of teamwork especially strange. Thousands of people traveled to see it, and the web got intense media coverage.

Researchers filled this abandoned ant colony with concrete, let it sit for a month, and then excavated around it to reveal a massive ant colony. The size and intricacy of the colony is almost hard to wrap your mind around-- it stretches over 4,000 miles, and in its construction, the ant colony moved 40 tons of soil. The unveiling of the ant colony begins at the 3:00 mark. 
Size isn't the only remarkable aspect of ant architecture. The end of the video features a colony of ants living in an acorn, just going to show how intricate their system is, no matter the size.