{"version":"1.0","type":"card","id":"33bafe88-b088-442e-8560-5db8be7c008b","url":"https://stacklist.com/card/33bafe88-b088-442e-8560-5db8be7c008b","title":"Secret Lagoon Hot Spring (80 km)","source_url":"https://secretlagoon.is/","note":"Iceland's oldest swimming pool, a natural geothermal lagoon at Flúðir dating from 1891. About 80 km from Hekla Horizon.","image":{"url":"https://ucarecdn.com/04a162d6-214b-440e-ab2b-3d213adc55f9/","alt":"Secret Lagoon Hot Spring (80 km)","width":2000,"height":1333},"stack":{"id":"f477d45e-2e38-4467-bac5-d452535dea3a","title":"What's Nearby: Places Around Hekla Horizon","url":"https://stacklist.com/c/travel/stack/f477d45e-2e38-4467-bac5-d452535dea3a"},"created_at":"2026-09-03T20:19:49.625Z","updated_at":null,"aco":{"summary":"Secret Lagoon, known locally as Gamla Laugin, is the oldest natural swimming pool in Iceland, established in 1891 in the geothermal area of Hverahólmi near Flúðir. It offers year-round bathing at 38-40 degrees Celsius, fed entirely by natural hot springs, with seasonal opening hours, tiered pricing, and an on-site guest house called Garður.","tags":["hot-spring","geothermal","iceland","natural-pool","tourism","swimming","travel"],"key_entities":[{"name":"Secret Lagoon","type":"location","confidence":1},{"name":"Gamla Laugin","type":"location","confidence":0.97},{"name":"Hverahólmi","type":"location","confidence":0.95},{"name":"Flúðir","type":"location","confidence":0.95},{"name":"Iceland","type":"location","confidence":1},{"name":"Garður","type":"location","confidence":0.85},{"name":"Litli Geysir","type":"location","confidence":0.9},{"name":"geothermal hot spring","type":"concept","confidence":0.95}],"classification":"reference","language":"en","confidence":0.85,"provenance":{"model":"claude-sonnet-4-6","tool":"@stacklist/mcp-server@2.0.0","confidence":0.85,"timestamp":"2026-09-03T20:19:59.901Z"},"token_counts":{"approximate":2047,"cl100k":2023},"content_hash":"sha256:f5091161ef0ea1dd3e439ec903c22016c3810c2a335565458ad4da10f7036bfb","acp_version":"0.2","body_available":true,"body_tokens":2047,"visibility":"public","agent_accessible":true,"status":"final"},"_links":{"self":"/api/public/card/33bafe88-b088-442e-8560-5db8be7c008b.json","html":"https://stacklist.com/card/33bafe88-b088-442e-8560-5db8be7c008b","md":"/api/public/card/33bafe88-b088-442e-8560-5db8be7c008b.md","stack_json":"/api/public/stack/f477d45e-2e38-4467-bac5-d452535dea3a.json"}}