The Doors of Moria

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The tattoo comes from moyerva34's Flickrstream and is listed under Creative Commons. The drawing? Unknown. (I couldn't find a free to use image of this!)

From The Lord of the Rings: A Journey in the Dark

The Moon now shone upon the grey face of the rock; but they could see nothing else for a while. Then slowly on the surface, where the wizard's hands had passed, faint lines appeared, like slender veins of silver running in the stone. At first they were no more than pale gossamer-threads, so fine that they only twinkled fitfully where the Moon caught them, but steadily they grew broader and clearer, until their design could be guessed.

At the top, as high as Gandalf could reach, was an arch of interlacing letters in an Elvish character. Below, though the threads were in places blurred or broken, the outline could be seen of an anvil and a hammer surmounted by a crown with seven stars. Beneath these again were two trees, each bearing crescent moons. More clearly than all else there shone forth in the middle of the door a single star with many rays.

Gandalf: "They are wrought in uhildin that mirrors only starlight and moonlight, and sleeps until is is touched by one who speaks words long forgotten in Middle-earth."