I am a deep, man-made hole in the earth, created by tearing away rock, stone, or sand. I hold secrets of the ground below, yet when I am filled with water, I become a place for a swim. What am I?

A constellation of land, amongst the waters of the world. No land bridge exists, unless manmade. Though tectonically, I'm all connected.

The Obelisk in washington, the seven wonders of the world. We all are this, forevermore.

What has roots as nobody sees, is taller than trees, up, up with it goes, and yet never grows?

At the crossroads where paths divide, A silent guide stands with arms spread wide. Directions given, none to abide, A sentinel of journeys, by the roadside.