Weightlifting 
To be weightlifting in a dream symbolizes discipline and training. You are working to increase your worth, your strength, and your confidence.
Revolving Door
*See Door.
Slaughterhouse
To dream that you are in a slaughterhouse implies that you may need to concede a quality or attribute so that you can continue on with your life. You may need to cut off a part of yourself in order to move ahead.
Parking Structure
To be lost in a parking structure in a dream implies that you are struggling to make progress toward a goal. You may feel that you are going around in circles and the situation never changes.
To be searching for your car in a parking structure in a dream indicates that you may reach your goal or a setback of reaching your goal which depends on the outcome of your search.