[Alexander Brodsky's pavilion on Lake Pirogovo, near Moscow, via flickr user Yuri Palmin.  Described in Metropolis in 2006:

...in winter 2003 a team of laborers under his direction trudged out onto [Lake Pirogov's] frozen surface and, in the frigid conditions, assembled a rectangular mesh cage about 40 feet long and 8 feet high that they proceeded to hose down with warm water. That water turned to ice, and when lit from its interior, the structure—a bar—glowed like a warm jewel. With spring’s thaw the cage was carted away; the rest sank to the bottom of the lake.]