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Alpena · US

Thunder Bay National Marine Sanctuary

Thunder Bay National Marine Sanctuary is America's only freshwater national marine sanctuary, protecting an estimated 200+ historic shipwreck sites in the crystal-clear waters of Lake Huron off Alpena, Michigan. Designated in 2000 across 4,300 square miles, this underwater museum lets visitors explore centuries of Great Lakes maritime history — by scuba, snorkel, kayak, glass-bottom boat, or simply from the life-size schooner on the museum floor. The gateway is the Great Lakes Maritime Heritage Center on the Thunder Bay River in downtown Alpena: a free-admission, year-round visitor center with interactive exhibits, dive tubes, and a reconstructed sailing vessel that together tell the stories behind the shipwrecks. Outside the building, the cold, clear water does what salt water never can — it preserves hulls, engines, and cargo virtually intact from a few inches down to 200 feet.