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The site of Korai-ji temple founded by Gyoki in 717 on Mount Koma — after the temple's end a Hachiman shrine took its place, preserving the memory of Oiso's ancient Buddhist heritage.

An Engishiki-listed ancient shrine on Mount Koma tied to immigrant culture — where Yoritomo is said to have prayed for the safe childbirth of his wife Hojo Masako.

A Nichiren temple bearing the mountain name Daijosan, founded in 1444 near Sagami Bay — preserving an unbroken tradition of Lotus Buddhism in Oiso for nearly six centuries.

A Jodo temple founded around 1600 where the celebrated novelist Shimazaki Toson — author of 'Before the Dawn' — is buried after spending his final years in Oiso.

A Nichiren temple founded in 1445, where Dr. Matsumoto Jun — who established Japan's first sea-bathing resort at Oiso in 1885 — lies buried, linking Buddhist heritage with modern medical history.

A Sengoku-era mountaintop castle (83.5 m) built as part of Hojo Soun's interlocking Tokaido defense line — earthworks and dry moats survive on Tennoyama hill in Oiso