The Thomas Viaduct: Construction commenced on the bridge on July, 4 1833 and finished, officially on July It spans in length and was the longest stone-arch masonry bridge of the time. It featured eight arches, which were in length.
Baltimore and Ohio Railroad Museum, Baltimore Maryland. Here's the B&O Roundhouse. It has a HUGE turntable/lazysusan inside that was used to redirect engines. Demos are scheduled now for your viewing pleasure.