  Models with extra spatial dimensions and TeV-scale gravity offer the first
opportunity to test the conjecture of black hole formation in trans-Planckian
energy scattering with small impact parameters. After a brief review of
gravitational scattering at ultrahigh energies and scenarios of TeV-scale
gravity, search strategies at the LHC, at the Pierre Auger (cosmic ray)
Observatory and at the neutrino telescopes AMANDA/IceCube are illustrated with
the simplest but nevertheless representative example: production of
Schwarzschild black holes and their observation via Hawking radiation in the
large extra dimension scenario. Some more general features of the production of
higher-dimensional black holes and/or uncertainties in the estimates are also
outlined.
