Also called "Tokugawa's Final Encampment", this is the spot where Tokugawa Ieyasu held a council meeting after the end of the battle and was presented with the decapitated heads of the enemy's leaders. A small shrine marks the spot.
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岐阜関ケ原古戦場記念館, Gifu Sekigahara Kosenjō Kinenkan
This new museum (built 2020) offers a good introduction to the battle itself. It is especially helpful because the first two exhibits (both visual media - a bird's eye view of the battle and an anime-like 4D theater movie depicting what it was like in the fray) provide the necessary background to understand how the 6-hour battle went and why Tokugawa won. The upper floors contain mainly replicas (although some original artifacts and documents are displayed) of writings relating to the battle or Tokugawa's rise to power, and then goes in depth of the aftermath of the battle and the consolidation of his rule. Kids and the young at heart will enjoy the third floor, which offers a hands-on exhibit where you can play around with different types of weapons used during the battle (such as katanas, matchlock rifles, and battle fans). The fifth floor is an observation deck that gives a panorama of the battlefield and town, and has signs (in Japanese) that indicate where each important thing is/was. The staff don't speak English and about 85% of the exhibits have English translations, but the movies have English subtitles.
歴史民俗学習館 Rekishi minzoku gakushukan
Renewed in 2020, this museum focuses on topics other than the famous battle, from archaeological times to today.
関ケ原宿本陣跡 Sekigahara-juku Honjin-ato
Sekigahara was one of the post towns along the Nakasendo. The honjin was a designated inn where passing daimyo and other important officials would stay. Like most of the honjin, the building no longer exists. On its former site there is a marker and a tree that stood in the front garden. The rest of the former honjin now contains Hachiman Shrine. The gate of Sekigahara's honjin is preserved in the neighboring town of Tarui at Honryuji Temple.
関ケ原宿脇本陣跡
Every post town had a wakihonjin which was an inn used for daimyo when the honjin could not be used, when more than one daimyo were staying, or for lower-level vassals who could not stay in the honjin. Wakihonjin were also available for the public to stay in when daimyo were not here. The wakihonjin no longer exists, but a replica of the gate was built here with a signpost. There is an additional signpost marking the birthplace of the Priest Shido Munan (至道無難禅師生誕地) who was a Zen master during the Edo Period.