
[Sendai City, Miyagi Prefecture] The ruins of ancient and modern "holes" are mixed with the "holes" of Atagoyama Yokonawa Tombs" and the "remain of Atagoshita Water Power Station"
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In the heart of Sendai city, about 2km south of JR Sendai Station, there are ruins dotted with strange side holes on the cliffs along the Hirose River, crossing the Atago Ohashi Bridge.
Atagoyama Yoko Anabogun , and is located nearby, with remains of a hydroelectric power plant that was operating in the Taisho and Showa periods, making it a mystery spot with many "holes."
The true identity of the hole is a group of horizontal tombs built around the 7th and 8th centuries.
The hole is located on the middle side of Atago Mountain along the Hirose River, and the nearest station is Atagobashi Station on the Namboku Line of the Sendai Municipal Subway. If you check on Google Maps, you will see it right above you, right up at the location of Atago Shrine.

The Hirose River is overlooking the Atago Bridge. We walk upstream along this gravel road next to the Hirose River for a while.

If you walk upstream about five minutes from Atago Ohashi Bridge, you will see a sight of many strange holes in the rock surface, just above it, at Atago Shrine.

When I got closer, there were so many holes. All of them are located on high cliffs, so it is difficult to look inside.

Right next to it is a signpost marked "Atago Mountain Horizontal Tombs." The signpost contains the following instructions:
The horizontal tomb is a tomb that is made into a tomb by digging holes into soft strata such as tuff from the side, and does not have a mound. The Atago Mountain Northern Tombs are distributed mainly on the north and eastern southerly slopes of Mt. Atago, and is thought to have been built in the 7th to 8th century, and the actual number of the Atago Mountain Tombs in the entirety of the 7th to 8th century is thought to exceed 100.

As mentioned above, these tombs were built during the Kofun period in the 7th to 8th centuries, and are collectively referred to as the Mukaiyama Yokonaka along with , Futatsuzawa Yokonaka Tombs , Shigegasaki Yokonaka Tombs, and the Sect Zenji Temple Yokonaka Tombs , which were discovered near the Miyazawa Bridge downstream
However, the Atago Mountain Northern Tombs, were destroyed by the development of residential land and road removal, and many of them were lost without their numbers and locations, and it seems that this is the only place that can be seen clearly as the ruins of the Tombs.
The existence of the horizontal hole has been known to locals since ancient times, and since then, new holes have been discovered in each development, including road removal work in 1936, Atago Ohashi Bridge work in 1973, road construction work in 1976, and housing construction work in 1991, and buried grave items such as human bones, Sue utensils, straight swords, and glass balls have been discovered.
The remains of the Atago Shita Water Power Plant, which was operating from the Taisho period to the Showa era.
At the very end of the Atago Mountain horizontal tombs, there are holes and structures that look like they are molded from concrete, with no discomfort, yet have a slightly different atmosphere from the other holes.

This is a hydroelectric power plant operated by Sendai Electric Industries Co., Ltd. in 1920, and appears to be the remains of an open recoil turbine facility at the power plant, which was then known as Aoba Electric Industries Power Plant Operations stopped around 1929 and remained in the present day.
now known as the remains of the Atago Shimo Water Power Plant

It seems that you could have explored the area in the past, but now the entrance is closed and is no longer open.

When I looked inside through the gaps in the rusted, decayed door, I found many leftovers. Under the panel that says no parking is written, "Former Atagoshita Power Station Research Group." It may have been left behind by someone who has researched this in the past.
If you search the internet for "Atago Shita Water Power Plant," you will find some blogs by people who have explored the interior in the past. If you're interested in the internal structure, try searching.
Atagoyama horizontal tombs <Information>
- Name: Atagoyama Yokonaka Tombs
- Address: 4-6-1 Koshiji, Taihaku-ku, Sendai, Miyagi Prefecture 982-0841
- Phone number: -
- Official URL: Sendai City Official Website – Atagoyama Yokonawa Tomb Group