The Chintien hall, inside a cavern, is seen inside the Chintien military base in Kinmen County, on November 25, 2008. Kinmen, which means “Golden Door” or “Golden Gate," is a small archipelago of several islands administered by Taiwan and located near Xiamen, China—no more than 2 kilometers (1.2 miles) away. The island was the site of extensive shelling between Communist and Nationalist forces during the first and second Taiwan Straits Crises. The hall was built as a shelter for military commanders to safely give instructions to soldiers during the shelling from the Communists. #

A woman collects oysters on a beach near anti-landing barricades in Kinmen County, Taiwan, on September 8, 2015. Rustic Kinmen, with a population of less than 129,000, is a half-hour ferry ride from China, but it takes an hour to fly to major Taiwanese cities. #

Shiyu, or Lion Islet, part of Kinmen County, one of Taiwan’s offshore islands, seen in front of Xiamen, China, on September 8, 2015. Just off Kinmen’s shores, glass-walled high-rises wink from the booming mainland port of Xiamen in one of China's most prosperous provinces. #

A soldier from a mine disposal unit stands in front of anti-landing barricades along a coast in Kinmen on May 18, 2009. In 2009, Taiwan removed many of its underwater naval barricades and landmines on beaches in the former military outpost of Kinmen for a cross-strait swimming event. #

Wu Tseng-tong, of the Chin Ho-li Knife factory, displays knives he has crafted from recovered artillery shells on August 22, 2011, on the eve of the 53rd anniversary of a massive bombing campaign on Taiwan's Kinmen Island. #

A warning sign is displayed on territory lined with landmines on Kinmen Island, Taiwan, on May 18, 2009. Tens of thousands of the mines were first planted back in the 1950s, when this Taiwanese beachhead was subjected to frequent Chinese shelling and war was a constant threat. The Taiwanese military has now cleared an estimated 96,000 mines concentrated in 154 fields around the island's perimeter. #

Zhaishan Tunnel, a mostly-completed shelter built for military boats, now a tourist attraction and occasional concert venue. See it on Google Street View. #

A low-tide walkway connects Kinmen to Jiangong Island, once known as “Exile Island” and rumored to have housed a leper colony, and now home to abandoned fortifications and a large statue of Koxinga, a Chinese military leader who ended decades of Dutch rule of Taiwan Island in 1662. See it in Google Street View. #