  We show that bosonic atoms loaded into orbital angular momentum $l=1$ states
of a lattice in a diamond-chain geometry provides a flexible and simple
platform for exploring a range of topological effects. This system exhibits
robust edge states, and the relative phases arising naturally in the tunnelling
amplitudes lead to the appearance of Aharanov-Bohm caging in the lattice. We
discuss how these properties can be realised and observed in ongoing
experiments.
