The Atomium is a monument built for Expo '58, the 1958 Brussels World's Fair. Designed by André Waterkeyn, it is 102-metres (335 ft) tall, with nine steel spheres connected so that the whole forms the shape of a unit cell of an iron crystal magnified 165 billion times.

Tubes connect the spheres along the edges of the cube.  They enclose escalators connecting the spheres which contain exhibit halls and other rooms. The top sphere provides a panoramic view of Brussels. 

View the virtual tour in this 360 degrees interactive panorama and see it as if you were there.