The history of geotechnical engineering is not very old and it was initiated by an understanding of soil mechanics in the early 19th century. The term “Geotechnology” which is now referred to as “geotechnical Engineering” first appeared in 1945. However significant applications of geotechnical engineering can be traced back to as early as the 11th century. Despite this fact, the subject is relatively young with many progresses and developments made at an extraordinary rate in the last few decades. Geotechnical engineering involves ground investigation, geotechnical laboratory testing, geotechnical instrumentation, geotechnical design and analysis, ground improvement and ground engineering. Progressive developments in these areas are discussed and documented in this keynote lecture. These engineering principles are not only applied in the construction industry but also have been applied in rescuing valuable heritage structures, transporting extra heavy equipment, investigating new planets, demolition and reconstruction of famous structures, warship engineering etc. This keynote lecture describes services provided by the geotechnical engineering discipline and presents some well-known case studies of geotechnical engineering services provided during history and demonstrates how geotechnical engineers have been involved around the world in well-known construction projects, case studies and protecting the environment we are living in.