Paris's other famous arch, a glass office building out on the outskirts of Paris

Out on the edge of Paris is a weird modern office building complex known as "La Défense," the centerpiece of which is the hollow cube–shaped skyscraper, Grande Arche de la Défense. (Techncially, it's not quite a perfect cube, as it measures 108m by 110m by 112m.)

It was built to line up perfectly along av. de la Grande Armee, through the Arc de Triomphe, and down the Champs-Elysées to place de la Concorde, the Tuileries gardens, and the Louvre.

Sadly, as of April 2010, you can no longer ride the elevator 363 feet to the top to see this effect and get nice Parisian views. The rooftop terrace was "temporarily closed" for safety reasons following an incident on the elevators. Soon afterward, a French federal government ministry (the one in charge of the environment, energy, development, and the sea) took advantage of the situation to appropriate the roof and its facilities for its own use—over the protests of Parisians and of the building operators.

Just in case this situation changes, I've included the usual open hours to the right.