The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

An avant garde art museum at the University of Chicago.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The humble field where the first Major League Baseball game was played.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Amsterdam's former hotspot for public executions and dissections.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Former headquarters of the KGB.

This stunning mass of ice spans 121 square miles and is still growing.

A small but industrious mining operation that allows visitors to touch precious gems while they are still in the rock.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This research hub in the Amazon Rainforest is perched amid one of the world's most biologically diverse landscapes.

A seemingly endless landscape of pure salt stretches far across Bolivia.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A 125-meter long "tribute to the Brazilian people."

This Brazilian town built by Freemasons is full of colonial Masonic architecture and symbolic imagery.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Walk through living pictures and music in the Cathedral of Images.

This ancient theater was once the home of fierce gladiatorial battles.