Climb inside an iron crystal magnified 165 billion times its normal size.

360° views of the city plus five floors of optical illusions and hands-on science.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Famously misunderstood wonder of the ancient world

The youngest volcano in Central America.

A pocket of jungle amidst urban expansion in Panama.

This "floating island" plateau sits 7,671 feet above the forest floor.

An abandoned colonial French prison notorious for its hellish conditions.

Now containing the bones of the actual conquistador, instead of someone else.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

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

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Astronomical observatory above Lake Titicaca.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

This hotel is located on the edge of the world's largest salt flat and is made out of the only material around.

This red lake 4,000 meters above sea level is home to rare flamingos.

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

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

The highest peak in Puerto Rico is home to a rare fern that can only be found on six trees at its summit.

An unusual round church in London with a Templar past.

One part local history, 99 parts gruesome haunted house.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.