An inventory is a set of technical operations for obtaining reliable information about a site in order to prepare technical and descriptive documentation, presenting the current state of objects. One of the measurement technologies allowing for the acquisition of reliable and comprehensive information about a site is terrestrial laser scanning. A point cloud from terrestrial laser scanning generates both 2D surveys and 3D models of various types of objects. The scope of research work included the application of terrestrial laser scanning (TLS) technology in the inventory of the Mechowo Caves – a cave in the village of Mechowo. The survey of the area in front of the cave and its part accessible to visitors was carried out using a Leica P40 laser scanner. Due to the highly varied shape of the cave ( multiple low and narrow passages) and its unique character, the measurement had to be performed in a non-standard way – with the use of numerous measuring stations with different combinations of measuring instrument settings and variable scanning parameters. As a result of the work, a point cloud was generated, based on which cross-sections presenting the spatial layout of the Mechowo Caves were created, as well as a 3D model of the area covered by the survey.