Last weekend, the museum revealed, albeit temporarily, the other main element of this permanent sculpture, "The Slot, " a 456-foot-long, concrete-lined trench adjacent to the Resnick Pavilion.

WSJ: Levitated Mass | Arrival of a Rock Start | By Arnie Cooper

Except for guerrilla kayaking by river lovers such as Raymond and others in the expedition club, the concrete-lined river has been strictly off-limits since the Depression era because the river is technically an Army Corps of Engineers flood control channel, officials said.

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With more than a hundred accredited diplomats, Iran's embassy in Managua - a massive compound surrounded by four-meter-high concrete walls lined with razor wire - is one of the largest diplomatic compounds in the world.

CENTERFORSECURITYPOLICY: Iran's global reach