The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.

Historic house-museum dedicated to the revolutionary gay graphic artist Tom of Finland.

This former luxury resort in Kaua'i is now an abandoned relic.

Once home to over 8,000 exiled Hawaiians suffering from Hansen's Disease.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

The Fox Sisters, America's leading mediums in the mid-19th century, possessed a table they claimed helped them "communicate" with the dead.

Toxic waste disaster that founded the Superfund program.

Museum dedicated to the struggles of the disabled.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

A failed Russian themed village and amusement park in Niigata prefecture.

Historical Japanese-Dutch relations are honored with haunted rides and flower fields in this replica town.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

This huge ship ran aground and has simply been left to sit there ever since.

Russian history in San Francisco.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

An ancient Viking village in North America that predates Columbus by 500 years.

This underground power plant looks more like a super-villian's lair than a public work.

This rocky spread has been squeezed up directly from the bowels of the earth.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

Did Gustav Eiffel design this enigmatic metal building?

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.