10:10

Five Minute Histories: Ghost Signs in Baltimore

13:16

Harvard Model Bridge Testing! Trusses and Beams

7:08

Five Minute Histories: Canton Railroad Transfer Bridge

7:53

Five Minute Histories: The Harbor Tunnel

15:58

The Amazing Recording History of Here Comes the Sun

12:04

Could the Baltimore Bridge have been saved? YES!

8:45

Five Minute Histories: Formstone

9:40

Five Minute Histories: The B&O Railroad in Baltimore