Castles with dead spaces, forgotten/secret rooms and passageways...

http://www.atlasobscura.com/places/secret-passages-of-mont-sainte-odile

http://www.dailymail.co.uk/news/article-2037644/Victorian-kitchen-remained-untouched-60-years.html

It's really too bad that more information isn't available for this one:
https://en.wikipedia.org/wiki/National_Library_of_India

Message in a bottle

Could this be the oldest message in a bottle ever found?
It seems unlikely to me, but the search continues.

The Hudson Stone

Abandoned in the northern wildness, disappearing without a trace (?)

Remote atoll is cursed/haunted, but has treasure!

It's too bad that most stories of pirate treasure are all story and no treasure.

Nazi ghost train gold

What bold adventuring [assuming the find is real of course]!

A letter found in a stone cairn in 1975, somewhere in Ontario (?)

A letter found in a stone cairn in 1975, somewhere in Ontario (?)
and a photo of the bold adventurers who found it.

Mountains giving up their dead as glaciers recede

http://www.bbc.com/news/world-europe-33802458