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Since the nation celebrated Presidents Day this week we thought it would be fun to take a look at some presidential rides, starting with President Obama's limousine.

SLIDESHOW OF PRESIDENT OBAMA'S LIMOUSINE

Obama's 2009 limousine has been nicknamed "The Beast," and for good reason. Unlike past presidential limos, this one isn't based on a specific Cadillac. According to Wikipedia, its chassis and driveline are assumed to be sourced from the GMC Topkick. We say assumed because when it comes to security details, just about everything is classified. What is known is that the Cadillac is fitted with military grade armor which is at least five inches thick.

Related: More Presidential Rides | SLIDESHOW

The press isn't allowed inside the President's ride but Car and Driver was told the interior includes LED lighting.

General Motors will say on the record that the limo incorporates design and technology features from several models such as the dual-textured grille, seen on the CTS Sports sedan, along with side profiles evocative of Cadillac's STS and DTS. Cadillac says major aspects of the cabin were cut and sewn by hand.

An embroidered presidential seal is positioned in the center of the rear seat back panel, as well as on each rear door trim panel. Outside, LED spotlights illuminate the U.S. flags on the fenders.

Cadillac stresses security was top of mind at all times during development to keep "The Beast's" functional capabilities confidential.

Cadillac has built limousines and special vehicles for U.S. presidents, diplomats, ambassadors and foreign dignitaries since the early 20th century.

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