Nestled within the pristine expanse of Biržai Regional Park in Lithuania, the Kirkilai Observation Tower stands as an example of allure and creativity in modern architecture. Rising nearly 32 metres above the lush landscapes, it offers an unrivalled vantage point to behold the beauty of the Kirkilai karst lakes. The natural wonder is formed by the dissolution of water-soluble rocks such as gypsum and limestone. Over time, the gradual erosion and collapse of caves in these rocks created depressions filled with crystal-clear water, resulting in these mesmerising and unique bodies of water. The interconnected lakes mirror the surrounding greenery, creating a scenic haven for nature enthusiasts.