During this particular visit we headed to the Ripley's Believe It or Not which sits right in Inner Harbor. There are a lot of eateries and shopping nearby...so plan to spend an afternoon while there. We had to pay for parking ($5.00) and walk down to the place which sat a few blocks away from the parking area.
Ripley's Believe It or Not offers several different attractions. They have the: Marvelous Mirror Maze, 4D Moving Theater and the Odditorium. You can buy tickets there or purchase them online. We recommend buying them online to save you some time. Prices range from $12.99 to $17.99 per attraction or get a discount when purchasing & combining multiple attractions for the same day.
We did the Marvelous Mirror Maze attraction too which was a lot of fun! Expensive...but fun! That took us about 20 minutes or so to do. If you have very little kids...I would avoid it as there were tiny kids in there clowning around which irritated some of the adults that were there.