The best museum in Baltimore! We were so close to booking this as the actual wedding venue, but the tradition and convenience of Overhills Mansion eventually won out. There are beautiful old trains, housed in an original roundhouse. They demonstrate how one man by himself can push an engine around on the wooden turntable (what a dance floor that could have been!) There's lots more there. We both highly recommend!
The aquarium is always a good choice. We especially like the sharks and the beautiful rays.
Hampden is a quirky part of town with lots of bars and restaurants. Check out The Bluebird for cocktails. It's where we had our first date. :)