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

An unnatural lake in a naturally beautiful setting.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

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

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

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

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A mocking tribute to the past and modern leadership of Prague.

Monument to a suicide protesting the Soviet invasion.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

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.

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.