Hasugaike Kofun Cluster - Credit: Wikimedia Commons
The is a cluster of tombs dug in artificial caves in a tuff cliff of located in the Yoshiki neighborhood of the city of Miyazaki, Miyazaki Prefecture in Kyushu Japan. It was designated as a National Historic Site in 1971 because it is the southern limit of the distribution of horizontal corridor-type kofun in Japan. Read more on Wikipedia
Source: en.wikipedia.org