I have seen a huge 5-segment solid rocket booster perform a full duration burn in the desert of Utah at Orbital ATK’s facility. Pro tip: if NASA tells you to not look at the flame, then do NOT look at the flame.
I’ve watched the incredible RS-25 engine static fired in a test stand at NASA’s Stennis Space Center in Mississippi. Twice.
I’ve been on top – ON TOP! – of the Vehicle Assembly Building at Kennedy Space Center (KSC)… within touching distance of a satellite at Ball Aerospace in Boulder… in United Launch Alliance’s (ULA) Denver Operations Support Center (DOSC) and in their Atlas Spaceflight Operations Center (ASOC) at Cape Canaveral Air Force Station (CCAFS). These are not easy places to access.