This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

This small fort played a huge role defending Puerto Rico’s capital city.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This 20th-century mansion plays a key role in one of Puerto Rico's greatest novels.

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

Years of neglect and nature took a toll on this 19th-century lighthouse.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

It's a pretty creepy lock-up.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

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

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

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

The world's second largest single-dish radio telescope, once used to contact E.T.

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

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

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

A mysterious castle built as a monument to lost love.