The three vandalized buildings -- the presidential palace known as the Planalto, the Supreme Court and Congress -- are themselves treasures of modern architecture designed by Oscar Niemeyer.The futuristic constructions, featuring the emblematic curves of the iconic Brazilian architect, are for many what earned the capital -- a landmark in the history of urban planning -- its classification as a UNESCO world heritage site in 1987.Louis XIV clockAn exquisite clock made by Balthazar Martinot, clock-maker to King Louis XIV of France, was found knocked to the ground on the third floor of the presidential palace, with extensive damage to its brown and gold casing and a gaping hole in place of the dial.According to the presidency, it was a gift from the Sun King to the Portuguese crown and brought by King Joao VI to Brazil in 1808, when he fled Lisbon as Napoleonic troops approached.Historic table used as barricadeThe work table of Juscelino Kubitschek, the visionary former Brazilian president behind the construction of Brasilia in the middle of the savannah and inaugurated in 1960, was also damaged."