1549 UNITED KINGDOM (Cayman Islands) - Best wishes from Hell

Hell is a group of short, black, limestone formations located in Grand Cayman, the largest of the three Cayman Islands. Located in West Bay, it is roughly the size of half a soccer field. Visitors aren't permitted to walk on the limestone formations but viewing platforms are provided. There are numerous versions of how Hell received its name, but they are generally variations on "a ministration exclaimed, 'This is what Hell must look like."

1396, 1408 UNITED KINGDOM (British Antarctic Territory) - Port Lockroy Historic Site

Port Lockroy is a natural harbour on the north-western shore of Wiencke Island in Palmer Archipelago, a group of islands off the northwestern coast of the Antarctic Peninsula, the northernmost part of the mainland of Antarctica. It was discovered in 1904 and named after Edouard Lockroy, a French politician who assisted Jean-Baptiste Charcot in obtaining government support for his French Antarctic Expedition. After the harbour was used for whaling between 1911 and 1931, during WWII the British military Operation Tabarin established the Port Lockroy base (Station A) on tiny Goudier Island in the bay.

The chief reason of this operation was to establish solid British claims to various uninhabited islands and parts of Antarctica, reinforced by Argentine sympathies toward Germany. After the war, Port Lockroy base continued to operate as a British research station until 1962. The site has been designated a Historic Site or Monument (HSM 61) under the Antarctic Treaty, in 19 May 1995. In 1996 the base was renovated and is now a museum and post office operated by the United Kingdom Antarctic Heritage Trust. It is one of the most popular tourist destinations in Antarctica.

0916 CANADA (Ontario) - Post Office and Town Clock at Eganville

Eganville is a small community occupying a deep limestone valley carved at the Fifth Chute of the Bonnechere River, in the township of Bonnechere Valley (formed in 2001 by the union of Grattan, Sebastopol, South Algona and Eganville). The power of the river has been harnessed since 1848, but it was John Egan's grist mill that gets credit for stimulating the town's growth, which took his name. In 1911, a great fire destroyed many of the buildings in Eganville. A year later, the Municipal Building was erected, and served as the village post office until 1973. In 2001 the building became the home of the Bonnechere Museum and one of the most well known symbols of Eganville.

0820 VIETNAM (Southeast) - Saigon Central Post Office

Former capital of the French colony of Cochinchina and later of the independent republic of South Vietnam, Saigon is officially called Ho Chi Minh City (after Hồ Chí Minh, the late North Vietnamese leader) for nearly 30 years, ie since 1976, but the old name is more often used than the new one not only in everyday speech, but also by the authorities. A good example is that on the postmark write Saigon, no Ho Chi Minh. Moreover, the inhabitants of the city weren't named ever otherwise than Saigonese. It seems that in this case, either the mercantilism, or the desire to preserve the tradition defeated the ideology.