Oido Prehistoric Park is at 113-27 Seohaean-ro, Siheung, Gyeonggi-do. It has prehistoric shell-mound heritage, educational huts, an exhibition hall and a lookout. A Korea Tourism Organization accessible-tourism project page posted in December 2024 lists five accessible parking bays in the main lot and two in a separate priority lot, accessible paths and lookout detour signs. The page describes wheelchair-accessible visitor transport to the lookout with assistance, a nursing space in the education hut, sign-language video and tactile learning equipment. It lists the shell-mound hall as 10:00–17:00 with Monday closure, but these are 2024 descriptions. Confirm 2026 service operation, reservations, staffing and opening hours with Siheung city. Do not treat a proposed service as currently operating without confirmation.