This art deco masterpiece was once a miracle spring mecca but is now simply a government office building.

This historic cliffside mansion uses a natural cave for air conditioning.

Community bookshelf of 25-foot-tall book spines.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

A rare example of an ancient Japanese hill castle believed to be the fortress of a legendary demon.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.