  We present new mid-infrared interferometric observations of the massive young
stellar object IRAS 13481-6124, using VLTI/MIDI for spectrally-resolved,
long-baseline measurements (projected baselines up to $\sim120$ m) and
GSO/T-ReCS for aperture-masking interferometry in five narrow-band filters
(projected baselines of $\sim1.8-6.4$ m) in the wavelength range of $7.5-13$
$\mu$m. We combine these measurements with previously-published interferometric
observations in the $K$ and $N$ bands in order to assemble the largest
collection of infrared interferometric observations for a massive YSO to date.
Using a combination of geometric and radiative-transfer models, we confirm the
detection at mid-infrared wavelengths of the disk previously inferred from
near-infrared observations. We show that the outflow cavity is also detected at
both near- and mid-infrared wavelengths, and in fact dominates the mid-infrared
emission in terms of total flux. For the disk, we derive the inner radius
($\sim1.8$ mas or $\sim6.5$ AU at 3.6 kpc), temperature at the inner rim
($\sim1760$ K), inclination ($\sim48$ deg) and position angle ($\sim107$ deg).
We determine that the mass of the disk cannot be constrained without
high-resolution observations in the (sub-)millimeter regime or observations of
the disk kinematics, and could be anywhere from $\sim10^{-3}$ to $20$
M$_\odot$. Finally, we discuss the prospects of interpreting the spectral
energy distributions of deeply-embedded massive YSOs, and warn against
attempting to infer disk properties from the SED.
