Another pyramid called Equinox International enlisted 250, 000 distributors before being shut down by regulators in April.

FORBES: Con.com

To the west of where the pyramid is today was another royal palace, the Tuileries, and it was a long-term ambition of the later French kings to link up both residences with two parallel wings, creating a great central courtyard.

BBC: Classic sights in the City of Light

Eleven air pillars now hold up the pyramid's roof, with another six, flatter, bespoke columns currently being manufactured to support the lower corners of the burial chamber.

BBC: Newport firm stabilises Egypt's earthquake-hit pyramid