A Christian monastery stands on what was once a holy Incan temple.

This bullring in Lima is the oldest in the Americas and the second-oldest in the world.

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

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A modern-day Lascaux cave underneath Paris.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A subterranean shelter remains intact under a busy Paris railway station.

The history of radiation is on safe display at the foot of a radiation science laboratory.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A surrealist timepiece by the artist of melting clocks.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The oldest stone house in Paris was built by its most famous alchemist.

A large-scale steel sculpture entitled 'The Shadow Boxer' pays tribute to Nelson Mandela.

The home of Mahatma Gandhi during part of the 21 years he spent living in South Africa is now a guest house.

The subterranean sanctuary home to local shamans is a sacred site for people of all religions.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.

A mesmerizing sculpture marks the site where the activist was arrested after evading capture for 17 months.

Local lore says a serpent-like beast lurks in the deep basin below the falls.

Largest cave system in Africa.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.

The tallest residential building in Africa is an unsettling Brutalist monolith.