Geumgang-san  금강산
the fabled & spectacular "Diamond Mountains"
of North Korea, once partially open for international tourism
Left:  the famous painting
"Entire View of Geumgang-san"
by Ahn Hyeon, 18th Century,
one of Korea's most important artists.

2018 Exhibitions of Paintings at the NYC Met Museum
Jeongyang-sa Temple, with a six-sided shrine (similar to the Dokseong-gak of Haein-sa)
in-between the Main Hall and the stone pagoda -- a unique arrangement.
the famous Buddha-Triad relief-carving at Sambul-sa [Three Buddhas Temple]
the Oknyeo-tang [Jade-Maiden Bathing-Pool] of Okryu-dong [Jade Pavilion Village] Valley
Yanghwa-sa Temple's Main Hall, with unique portraits of Sages
UPDATE:  in what is both a crime against the highly-sacred historical character of this
mountain and an inevitable step of modern-tourism development, "The first golf course
on North Korea's Mt. Geumgang is under construction" and was supposed to open in
2007; since the shutdown in Fall 2008, I've seen no word on whether it actually did.  
"The course has several specially designed holes, including a par seven hole, the
world's longest with a length of 1,014 yards, and a par 3 hole, which is also known
as the 'hole-in-one' hole" -- reported on August 18th, 2006.

2012 article on the desolated outer-Geumgang Tourism Area by Donald Kirk
North Korean dictator-III Kim Jong-un and First Lady Ri Sol-ju,
hiking in Geumgang-san in early 2019, from an NK news-site