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

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

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

The Columbia Road Flower Market is now open every Sunday, rain or shine.

This London plaque marks the spot where David Bowie's famous alien made his debut.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

A clock designed to run with perfect accuracy for 10,000 years.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

The television series' iconic giant foot was borrowed from this classical painting.

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

London's old-school healing garden.

This hidden green space is the city's second largest conservatory.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

The final resting place to 300 Victorian-era pets hides inside the city park.

This 1920s Dutch barge is now a floating bookstore.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Hear the quietest sound from across the dome.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.