A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

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

Did Inca children also slide down these smooth rocky slopes above Cusco?

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

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

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

An unexpected desert oasis in South America.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

A monument to the conquistador became increasingly controversial in the very city that he founded.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

The large collection of pre-Columbian pottery might make you blush.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

Pre-Incan aqueduct amidst a stone forest in Peru.

After an epic flood washed away its enslavers, this city has been part ghost town, part cultural wildcard for the past three centuries.

Recently restored menagerie of Victorian-era beasts.

Giant, friendly pelicans in Central London, the most unlikely of places.

At just 51 feet and 10 inches long, it's the shortest street in England.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A surreal statue honoring Prague's favorite literary son.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.