IN 1875, the 100-acre island off New Rochelle now run by the county and known as Glen Island Park was a privately owned amusement park. Now one large expanse of land, it then consisted of five islands that could only be reached by boat; each one had a different international theme. One of the most popular was set up as a German beer garden, complete with Bavarian-style stone structures built to resemble castles.
Today, two 30-foot-high stone turrets are all that remain of the old amusement park. One is used to store sculls and oars used by Iona College rowing teams; another is roped off because of the danger of falling rocks.
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[EDIT] The island park acquired the name "Glen" after famous big band leader, Glen Miller. At his peak, he owned and operated the nightclub on the island. During warmer months, the castle facitly is hidden among trees, which makes it impossible to photograph the entire castles. There are still two castles standing, and a small stone guard shack type of building.
The first posted photograph is the smaller of the two buildings.
EOS M3, EF-M Adapter, EF 40mm f/2.8 STM, 1/80 sec, f/8, ISO-100.
The shot above is the rear of the main castle, which includes a mini-courtyard with an arched entrance, and turrets at each corner, the tallest of which is several stories tall. I cannot find a written description of its' height, but it as least 40 feet tall.