•  The archeological site "Wild Park"
•  Astronomical Observatory
•  Nikolaev Catacombs
•  Yacht Club
•  Tower of Shuhov
•  The Zoo
•  The Children's Garden "Kazka"

Out of sight, beneath our city, is a network of subterranean passages. Many are clearly the work of man, with their construction documented, or implied, in contemporaneous records. Others appear to have been formed naturally.

The first is composed of basements and cellars dug during early construction. Most are three to four meters deep, but a few go as far as twenty meters below the surface. Information on these spaces is scattered and exists primarily in building company reports, prepared during new construction on old sites. Some investigative work on old basements was done in the 1920s but the effort was not productive because so many sites had been disturbed by that time.

Scientists believe that a third, even deeper, layer is of natural origin. Because there has been little systematic investigation of these spaces, they are less well understood. An archaeologist named Andriy Maystrenko studied, and partially mapped, some of them.

The second layer, below the basements, is composed of the remnants of plumbing work done during the 1820s. One of the largest parts of that work was a five kilometer tunnel, dug beneath Admiralskaya Street. The engineer for that project was A. Rokur de Sharlevilya. One hundred and thirty years later, in 1956, the Military Fleet directed engineer Oleksander Vasylyovych Alekseyev to locate and map tunnels beneath the city.

During early construction, lime was mined from the banks of the Bug estuary and, apparently, from underground areas now beneath the city. Building stones were taken from the ground as well, with some quarries reported to have gone to depths of 20 or 30 meters before branching into galleries.

In 1885, during a brief war, Mykolayiv found itself in a state of siege. General E.I. Toleben, a noted builder of fortifications, came to the city. Based on his experience defending Sevastopol, he ordered that existing underground galleries be found, connected, and enlarged.

The second layer, below the basements, is composed of the remnants of plumbing work done during the 1820s. One of the largest parts of that work was a five kilometer tunnel, dug beneath Admiralskaya Street. The engineer for that project was A. Rokur de Sharlevilya. One hundred and thirty years later, in 1956, the Military Fleet directed engineer Oleksander Vasylyovych Alekseyev to locate and map tunnels beneath the city.