Robert has climbed landmarks including the Burj Khalifa, Eiffel Tower, the Sydney Opera House and the Montparnasse Tower as well as other of the world's tallest skyscrapers. In 1997 he climbed the Petronas Twin Towers in Kuala Lumpur, Malaysia but was arrested at the 60th floor, 28 floors below the top. In 1999 he climbed the Sears Tower, the second man to do so after Dan Goodwin. In June 1999 Robert climbed the Marriott Hotel in Warsaw and in 2000 he climbed the high Luxor Obelisk in Paris.