This was an exact replica of an Ocean Monument from the new 1.8 snapshot. Since we don't have the materials used in 1.8 I've substituted similar blocks. This version is specifically designed for placement on land and is heavily damaged to appear as ancient ruins.

The building will be pasted directly beneath you, as if you were standing on its highest point. This makes it easier to place it at a depth where the tip is 3 or 4 blocks below the surface as you would find it generated.  There should be approximately 24 blocks of water depth wherever you paste.

WARNING!!! 
You must use "//paste -a" to place this build in your landscape without creating a massive hole.