Earth and Man National Museum, Mineralogical museum in Lozenets, Sofia, Bulgaria.

The Earth and Man National Museum occupies a restored 1896–1898 building of 4,000 square metres, the largest structure of the former Sofia Artillery Arsenal. Its six sections hold over 37,000 items, including the Giant Crystals collection donated by Iliya Delev in 1985 and a systematic mineral collection of 7,600 specimens covering 1,591 mineral species from 111 countries.

The building dates from the 1890s and was originally part of a larger arsenal complex in Sofia. It was converted into a museum in the mid-1980s to make the mineral collection accessible to the public.

The museum serves as a place where visitors learn about the diversity of Earth's minerals and geological formations. It hosts regular educational events and concerts that connect science with cultural experiences for different age groups.

The museum occupies a 4,000-square-metre building with exhibition halls, laboratories, a video room and a conference room. Its six collections are arranged by theme, from giant crystals to new materials, so allow time to move between sections. The building is a restored 19th-century structure adapted by architect Hristo Ganchev.

The collection covers about 40% of all known naturally occurring minerals, and it also holds man-made ceramics made by Bulgarian scientists. The Giant Crystals hall, built around Iliya Delev's 1985 donation of Brazilian crystals, is one of only two large collections of its kind in the world.