  Inspired by the Basilica group $\mathcal B$, we describe a general
construction which allows us to associate to any group of automorphisms $G \leq
\operatorname{Aut}(T)$ of a rooted tree $T$ a family of Basilica groups
$\operatorname{Bas}_s(G), s \in \mathbb{N}_+$. For the dyadic odometer
$\mathcal{O}_2$, one has $\mathcal B = \operatorname{Bas}_2(\mathcal{O}_2)$. We
study which properties of groups acting on rooted trees are preserved under
this operation. Introducing some techniques for handling
$\operatorname{Bas}_s(G)$, in case $G$ fulfills some branching conditions, we
are able to calculate the Hausdorff dimension of the Basilica groups associated
to certain $\mathsf{GGS}$-groups and of generalisations of the odometer,
$\mathcal{O}_m^d$. Furthermore, we study the structure of groups of type
$\operatorname{Bas}_s(\mathcal{O}_m^d)$ and prove an analogue of the congruence
subgroup property in the case $m = p$, a prime.
