An old slave lookout in Cuba's historic sugar cane fields.

Site of James Cook's historic observations of the 1769 transit of Venus.

An underground city of salt.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

Come for the flowers, stay for the bats!

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

Model Trains and Much More in Hamburg.

Christ's blood preserved in a Belgian town.

This deceptively salty lake looks like blushing pink lemonade.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Go inside to really appreciate this 500-year-old technological masterpiece.

The Uros people live on floating reed islands in lake Titicaca.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An incredible garden taking over the interior of a massive sinkhole.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This antique thermometer honors the creator of the first universal temperature scale.

This elaborate temple was built around one of the Buddha's teeth.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.