Oura Catholic Church

The Oura Church or Oura Cathedral, officially the Basilica of the Twenty-Six Holy Martyrs of Japan, is a Catholic minor basilica and co-cathedral in Nagasaki, Japan, built soon after the end of the Japanese government's Seclusion Policy in 1853. It is named after the 26 Japanese Martyrs. For many years it was the only Western-style building declared a national treasure, and is said to be the oldest Christian church in Japan.

Source: Wikipedia