Here are three stamps featuring Lake Rotomahana, New Zealand. The first two stamps show features of the pre-1886 site. They are the 4d. value of 1898 (S.G. #252) depicting the White Terrace, and the 9d. value of 1898 (S.G. #256) showing the Pink Terrace.
The Third stamp is an issue of private courier Fastway Post New Zealand Ltd. It shows post-1886/present-day Lake Rotomahana and its steaming cliffs.
From Wikipedia, "It is immediately south-west of the dormant volcano Mount Tarawera, and its geography was substantially altered by a major 1886 eruption of Mount Tarawera...The Pink and White Terraces were a natural wonder on the shores of the lake before the 1886 eruption. They were considered to be the eighth wonder of the natural world and were New Zealand's most famous tourist attraction during the mid 19th century, but were buried or destroyed by the eruption."