I am in a room, which is sort of like a large greenhouse, walls of small rectangular windows and a curved glass ceiling. The windows are old and slightly opaque giving some light from the sun outside but not direct sunlight. The room has a large pool, which is rectangular as well, but with smaller rectangular sections running perpendicular that have steps into the dark water. The water isn't really dirty, just dark. There is a large seemingly dead tree on one side with the roots going into the ground and out into the water. Large broken branches reach to the ceiling. It's also hollow. Once, when I went swimming, I climbed up inside the tree. Behind me is the rest of the house, with some steps leading to some large french doors which are open into a foyer with a second story that has a large curved window in it and with another set of large french doors leading to the outside but closed. The room is all tile with a design that I can't quite make out. I get the vague sense that I probably shouldn't be there or that feeling that keeps making you look over your shoulder, almost like the house is deserted, except the ghosts. (Haunted?)

Using Dream Moods, I found the following:

Tree

To dream that you are climbing a tree, signifies that you will achieve your career goals and reach those high places in society. The degree of difficulty to which you climb the tree will measure the speed of your achievement of these goals

Roots

To see roots of the trees or plants in your dream, symbolizes the depths and core of your unconscious mind and soul. It represents your values and belief system. Alternatively, it denotes your family ties and bonds. You may be searching into your past

Branches

To see branches in your dream, is a symbol of good luck, growth, and new life. Alternatively, branches represent the relationships and communication between you and your family/relatives.

To see broken branches in your dream, indicates some personal or work-related problem

Pool

To see a pool of water in your dream, denotes that you will find much happiness and pleasure in love and marriage. Your social life will keep you busy.

Hollow

To dream of something that is hollow, represents the womb and nurturance. It may also symbolize your hidden secrets. Alternatively, it may indicate that you are feeling empty, worthless, or insignificant in your waking life.

Swimming

To dream that you are swimming, suggests that you are exploring aspects of your unconscious mind and emotions. The dream may be a sign that you are seeking some sort of emotional support. It is a common dream image for people going through therapy.

To dream that you are swimming underwater, suggests that you are completely submerged in your own feelings. You are forcing yourself to deal with your emotional difficulties.

Climb

To dream that you are climbing up something (ladder, rope, etc.), signifies that you are trying to or you have overcome a great struggle. It also suggests that your goals are finally within reach. Climbing also means that you have risen to a level of prominence within the social or economic sphere.

Window

To see windows in your dream, signifies bright hopes, vast possibilities and insight.

To dream that you are looking out the window, signifies your outlook on life, your consciousness, point of view, awareness, and intuition. You may be reflecting on a decision and seeking guidance. If you are looking in the window, then it indicates that you are doing some soul searching and looking within yourself.

To see shut windows in your dream, signifies desertion and abandonment.

To see shattered and broken windows, denotes misery and disloyalty.

To see a tinted window in your dream, represents you need for privacy and your ways of getting it. You are keeping aspects of yourself hidden or that you want to remain ambiguous.

Greenhouse

To dream that you are in or see a greenhouse, represents transformation. You are experiencing some changes in your life brought about mainly as a result of your own doing. It also suggests that you may be too overly controlling. You want things done your way, but in the process you may be isolating yourself.

Door

To dream that you are entering through a door, signifies new opportunities that will be presented before you. You are entering into a new stage in your life, moving from one level of consciousness to another. I n particular, a door that opens to the outside, signifies your need to be more accessible to others, whereas a door that opens into the inside, denotes your desire for inner exploration and self-discovery.

To dream that of locked doors, signifies opportunities that are denied and not available to you or that you have missed out on.

House

To dream of a haunted house, signifies unfinished emotional business, related to your childhood family, dead relatives, or repressed memories and feelings.