Skyscraper powered by wind turbines attached between its towers.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This artificial archipelago was supposed to resemble a map of the world.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

This former sugarcane transport tunnel is now a portal to a lovely beach.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

The world's brightest bioluminescent bay.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

A mysterious castle built as a monument to lost love.

Former villa and estate of James Deering developed to preserve native tropical forests.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.