  The highly granular calorimeter prototypes of the CALICE collaboration have
provided large data samples with precise three-dimensional information on
hadronic showers with steel and tungsten absorbers and silicon, scintillator
and gas detector readout. From these data sets, detailed measurements of the
spatial structure, including longitudinal and lateral shower profiles and of
the shower substructure and time structure are extracted. Recent analyses have
extended these studies to different particle species in calorimeters with
scintillator readout and steel and tungsten absorbers, to energies below 10 GeV
in a silicon tungsten calorimeter and have provided first studies of the shower
substructure with gaseous readout and unprecedented granularity of
$1\times1$~cm$^{2}$ over a full cubic meter. These results are confronted with
Geant4 simulations with different hadronic physics models. They present new
challenges to the simulation codes and provide the possibility to validate and
improve the simulation of hadronic interactions in high-energy physics
detectors.
