Structural control health monitoring (SCHM) is strategic for safety and conservation of historic buildings and monuments. Currently there are available different techniques to obtain reliable results, and they could be invasive or not invasive. The dynamic monitoring, which is global not invasive one, is particularly efficient. In this field, the use of accelerometers to detect fundamental frequency, damping coefficient and modal shapes is common. These dynamic parameters are useful to understand residual stiffness and damages. This study proposes some results on a recent technique with warless velocimeters, named tomograph - easy to apply and rapid in giving outputs – with whom is possible to record ambient vibrations and to transform these in dynamic parameters by OMA (operational modal analysis) approach. The study focuses a review founded on four selected cases studies – Katmandu, Venice, Ragusa (Italy), L’Aquila (Italy) - which have been chosen due to a specific rationale. In detail, they are all monuments with complex structures, in seismic or sensitive areas, with the need to understand general dynamic characteristics and dominant modal shapes. Findings are addressed to outline benefits and/or criticisms in using results for rapid strategy intervention in monuments and historic constructions.