Castle Bravo
Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of "Operation Castle". Detonated on March 1, 1954, the device was the most powerful nuclear device detonated by the United States and its first lithium deuteride fueled thermonuclear weapon. Castle Bravo's yield was 15 megatons of TNT, 2.5 times the predicted 6.0 megatons, due to unforeseen additional reactions involving Li, which led to the unexpected radioactive contamination of areas to the east of Bikini Atoll.
Castle of Castelo Branco
In 1981, structures that belonged to the GNR, and which were addorsed to the walls along the "Rua Vaz Preto" were demolished. During the course of the demolition of houses along "Rua Vaz Preto", part of the original wall and towers were re-discovered. This led to the 5 June 2009 proposal to seek a formal classification of the site's heritage status. On 26 October 2009, the DRCCentro requested the castle's classification as a "Property of Public Interest". It was accepted on 28 October by the consultative council of IGESPAR, but the process was archived on 7 January 2013, and the site never obtained its classification.