Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A mysterious "wedding cake" castle in the middle of the urban desert.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A self-built castle made by a mysterious man.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The first permanent memorial to a unique secret weapon of World War II.