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Optical Coherence Tomography (OCT) has been initially developed as a non-invasive high resolution optical imaging modality for ophthalmology, followed by rolling the technology to other medical fields. OCT has however considerable potential in non-destructive testing, that can be employed in art conservation and material characterisation. An important advantage of OCT is that high axial resolution is achievable at comfortable working distances, which is an important requirement for safe scanning of patients as well as of valuable materials or objects of art. The review will present the OCT technology and its applications as well as recent developments in the field of broadband sources such as supercontinuum for ultra-high axial resolution OCT and in the field of tunable lasers for ultra-fast swept source OCT.