Tenmondai-Kōnai Kofun, Ancient burial mound in NAOJ Mitaka Campus, Japan.
The Tenmondai-Kōnai Kofun is a round-topped burial mound located on the grounds of the National Astronomical Observatory Japan in Mitaka. The raised earthen structure stands amid modern laboratory buildings and telescope installations, creating an unusual contrast between archaeological monument and contemporary research facility.
This burial mound was built around 700 AD during the Kofun period, when influential members of society were buried with valuable artifacts and ritual objects. The monument survived the centuries and was later incorporated into the observatory grounds, where it remains preserved today.
The mound reflects early Japanese burial practices and sits on the grounds of a modern research facility today. This placement brings together two different worlds: honoring the past with advancing scientific knowledge.
The monument sits on private observatory grounds and is not freely accessible; visits require advance permission or participation in guided tours. It is best to contact the facility ahead of time to ask about visiting options and current access rules.
The burial contained terracotta figures and sacred objects that reveal how early Japanese nobility honored their departed with elaborate offerings. These findings show the wealth and status these individuals held in their society.
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