D&D 5E (2014) A DM in need of assistance: the Interior of Tiamat's Temple

[DMZ2112]

IMO, the "chapels" are protrusions on the top portion of the ceiling, so you'd need to be flying the reach them.
That said, I think this should've been Tiamat's temple description.

You can actually get there without flying, but you can neither tarry nor hurry.

 

[MonsterEnvy]

You can actually get there without flying, but you can neither tarry nor hurry.

By climbing I am guessing.