Another famous example: Hearst Castle [1] I think the "historic" key is correct.
This is what Google proposes as definition and synonyms: adjective: historic 1. famous or important in history, or potentially so. "we are standing on a historic site" synonyms:significant <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+significant&sa=X&ved=0CB8Q_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, notable <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+notable&sa=X&ved=0CCAQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, important <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+important&sa=X&ved=0CCEQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, momentous <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+momentous&sa=X&ved=0CCIQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, consequential <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+consequential&sa=X&ved=0CCMQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, memorable <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+memorable&sa=X&ved=0CCQQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, newsworthy <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+newsworthy&sa=X&ved=0CCUQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, unforgettable <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+unforgettable&sa=X&ved=0CCYQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, remarkable <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+remarkable&sa=X&ved=0CCcQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5> ; famous <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+famous&sa=X&ved=0CCkQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, famed <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+famed&sa=X&ved=0CCoQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, celebrated <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+celebrated&sa=X&ved=0CCsQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, renowned <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+renowned&sa=X&ved=0CCwQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, legendary <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+legendary&sa=X&ved=0CC0Q_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5> ; landmark <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+landmark&sa=X&ved=0CC4Q_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, sensational <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+sensational&sa=X&ved=0CC8Q_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, groundbreaking <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+groundbreaking&sa=X&ved=0CDAQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, epoch-making <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+epoch-making&sa=X&ved=0CDEQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5>, red-letter, earth-shattering <https://www.google.com/search?lr=&safe=images&hl=en&as_qdr=all&q=define+earth-shattering&sa=X&ved=0CDIQ_SowAGoVChMIv777g_jDyAIVBDAaCh1nxwG5> "the historic first flight at Kitty Hawk" [1] http://www.openstreetmap.org/way/90954902 <https://lists.openstreetmap.org/listinfo/tagging> > >
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