Just some of the hats collected by the Yellowstone National Park Geology Program from sensitive thermal areas throughout the park in 2025. (Margery Price/NPS via SWNS)

By Dean Murray

Geologists at Yellowstone National Park have pulled more than 300 lost hats from the famous hot springs.

The headwear, estimated to be worth over $6,000, is among a range of items collected so far this year, including a Birkenstock sandal, a stuffed koala toy, and a pizza box with slices still inside.

A researcher collects a sample of thermophilic cyanobacteria from a hot spring in Yellowstone's Lower Geyser Basin. (NPS via SWNS) By Talker

A team from the Yellowstone National Park Geology Program is tasked with removing items from the park's sensitive thermal areas.

So far in 2025, the crew has col

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