Smokeywolf - that is exactly the emotion they are intended to evoke. Me, too. Moreso because I know how
difficult it is to make all that work, and stand for centuries. That many Roman buildings and bridges still stand is amazing.
The main structural issue is that a stone arch puts all the stones the arch in compression, which stone
resists well. But stone resists tension very poorly. So arches are great, but they add side
thrust to the supports for the arch. When you make very, very tall stone pillars with an arch
on the top......the arch wants to push the pillar over. So you put another arch, trending down,
to keep the pillar open, let in light to the stained glass walls. These arch out and downward
continuously, to reach the ground -- so the side thrust is carried through these flying
buttresses which are unseen from the interior, and let in light freely, and keep those tall
thin pillars inside from toppling outward.
Like this:
Short version of why cathedrals are cools structures. The buttresses to the left of the
big round main window in this pic are regular buttresses, doing the same thing, just more
clunky, heavy and block more light, force smaller windows. On the right are the flying
buttresses. This is Notre Dame de Paris, a nice example. There are MANY.
Here is a shot I took last hear in the main hall in Trajan's Market, the first shopping mall,
built in around 70 AD, and still standing - NOT rebuilt in any way. Maintained a bit.
Note the second floor open gallery leaves the first pillars which support the arched
ceiling with inadequate lateral thrust capability. So, the designer, desiring to leave the
lightness and airiness of the upper walk, put those short lateral arches to resist the
thust. Same exact thing as a flying buttress, but a millennia plus earlier.
Each opening, framed in white travertine marble, was a separate retail business stall with
an upper vaulted ceiling, and an opening for light. Wooden door slabs fitted into 2" deep grooves in the
floors and walls to close the openings at night for security. They did have
padlocks in those days. There were over 70 separate business locations in the whole complex
of Trajan's market and most still stands.
Even today, it feels light, open and airy, all natural light.
Bill