Not exactly in Baltimore, but DC is close enough! Over Easter break we took our kids to the "free" National Building Museum in Washington. Just being in the amazing space itself is worth it. The vast central room must be 50' tall and the columns are like something out of ancient Greece. We went to see the current LEGO exhibit ($5/person over 3 years old) featuring these amazing skyscrapers built by one of LEGO's 9 master builders. The largest was about 12' tall and