12 Ghostly Industrial Relics: Factories & Mines Frozen in Their Prime

By

Akanksha Sharma

May 26, 2025

12. Rummu Quarry & Prison, Estonia

Rummu Quarry Lake is known for its crystal clear water (due to which the lake has earned the nickname "Light Blue Lagoon") & its interesting history. The quarry behind Murru prison was once completely dry. Limestone was mined there through the ages. P. Photo Credit: Wikimedia Commons @Rita Helisma

This Soviet-era limestone quarry and adjacent labor prison was abandoned and then, quite literally, drowned. After the pumps were turned off, groundwater flooded the excavation pits—submerging watchtowers, prison walls, and factory floors. Today, the site is eerily beautiful: turquoise waters surround ruined structures that jut above the surface like dystopian ruins. Divers explore sunken buildings; swimmers pass graffiti-tagged remnants. It’s surreal—a place where oppression has been half-erased by water, but not forgotten. Above and below the surface, Rummu feels like a dream turned inside out—industrial decay disguised as a summer escape.

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