A trip to Japan wouldn't be complete without visiting the country's medieval castles, and the most-visited one is a sturdy historic keep outside of Tokyo.

The latest damage occurred during two earthquakes in April 2016 and much of the castle, considered one of Japan’s finest ... even down to the tap water, which is derived from natural groundwater.

The International Council on Monuments and Sites (ICOMOS), an advisory body to UNESCO’s World Heritage Committee, has supported Japan’s nomination strategy that emphasizes the castle’s role ...