Tour the Moscow Kremlin

The Moscow Kremlin is the most famous kremlin in all of Russia. Pictures of the Kremlin show a red-walled fortress-like enclosure that holds cathedrals, palaces, government buildings, and some surprising, oversized remnants of the past.
The Kremlin, as in centuries past, is the center of government in Russia. But it's also a historic heart of Moscow and one of the city's most important and most visited sights. Visiting the Kremlin should be on every Moscow traveler's list of things to do. There, you can explore the Kremlin's grounds, take photos, view cathedral interiors, and be amazed by museums treasures.
Even if you can't make it to the Kremlin yourself to view its historic buildings, you can still enjoy much of what the Kremlin has to offer through this photo tour. The pictures represent the structures found within the Kremlin, and the accompanying explanations tell you why they're important.

The Grand Kremlin Palace, pictured between the towers in the photo above, was the official Moscow residence of Russian tsars. Built in the middle of the 19th century, it replaced a palace situated in the same location. Its construction made room for the inclusion of already existing palaces: the Palace of Facets, the Terem Palace, and the Tsarina's Golden Chamber. It is now used for ceremonies and important state receptions.
The most recently constructed section of the Grand Kremlin Palace overlooks the Moscow River and appears to be three floors, though the upper floor is actually two stories high. Reception halls make up the interior of the palace, along with the personal chambers of former tsars, such as a study, drawing room, and dining room.
From afar, you can see the towers and walls of the Moscow Kremlin. In this picture, the Grand Kremlin Palace is also visible above the trees. The Kremlin has 19 towers in all (plus a 20th tower that is an outlying tower on the bridge). The wall running between them surrounds the Kremlin's buildings.

The Spasskaya Tower of the Kremlin has several interesting details. Built in 1491 by an Italian architect, it's gate serves as the Kremlin's "main entrance" from Red Square - this was once used for ceremonial processions.
Sources differ on when the Kremlin clock first appeared on the Spasskaya Tower, and it has been replaced many times over the course of the centuries. The clock you see today on the tower was installed in the middle of the 19th century.
The star on top of the Spasskaya Tower is its newest addition - the Soviets added it during the 20th century.