On the hill adjacent to the hotel is Hie Shrine, which is surrounded by a lush forest.
Hie Shrine protects the heart of Japan as the guardian of the Imperial Palace. In 1659, it was moved to Hoshigaoka, a scenic spot overlooking a reservoir, where it remains to this day. The main shrine building was burned down during the Great Tokyo Air Raid in 1945, but was rebuilt in 1958 as part of the Showa Imperial Construction Project.
Every June, the Sanno Festival is held here, known as one of the three major festivals in Japan and the first of the three major festivals of the Edo period. In recent years, the shrine has also become known as one of Tokyo's leading "power spots," with a never-ending stream of people coming to pray for protection from evil, warding off evil spirits, finding a partner, having children, and safe childbirth.

The Treasure Hall, which houses the treasures of Hie Shrine, was built the year after the 500th anniversary of the shrine's establishment within Edo Castle in 1978, as a commemorative project. In addition to 31 swords, some of which are national treasures and important cultural properties, the shrine also houses many treasures related to the Tokugawa Shogunate.

On both sides in front of the main shrine, there are statues of a married couple of divine monkeys who are the messengers of Hie Shrine. On the right is a male monkey, and on the left is a female monkey holding a baby. The male monkey is worshipped by those praying for prosperity in business, and the female monkey is worshipped by those praying for safe childbirth and fertility.