Hamilton Mausoleum
Hamilton Mausoleum is a mausoleum located in Hamilton, South Lanarkshire, Scotland. It was the resting place of the family of the Dukes of Hamilton. Built in the grounds of the now-demolished Hamilton Palace, its high stone used to hold the record for the longest echo within any man-made structure in the world, taking 15 seconds for the sound of a slammed door to fade. In 2014 the record was broken at the Inchindown oil storage tanks in the Scottish Highlands. Construction. In line with his grandiose enlargement of Hamilton Palace, Alexander, 10th Duke of Hamilton, replaced  his family burial vault which stood close to the east quarter of the palace in the aisle of the old and dilapidated collegiate church. Now the solitary remaining testament to the colossal scale and grandeur of the buildings which once stood in Hamilton Low Parks, Hamilton Palace Mausoleum is a Roman-style domed structure of panelled masonry. Standing to an overall height of about , it occupies a site some north of the site of Hamilton Palace. Construction was begun in 1842 by architect David Hamilton and completed by architects David Bryce and sculptor Alexander Handyside Ritchie in 1858, five years  after the death of the 10th Duke. The Duke was interred in an Egyptian sarcophagus of the Ptolemaic period, on a black marble slab in the main chapel, while 17 of his ancestors were interred in the crypt below. By the 1920s subsidence and flooding from the River Clyde affected the mausoleum. In April 1921, with the consent of the Marchioness of Graham and Lady Mary Victoria Douglas-Hamilton, the trustees of the 12th Duke of Hamilton petitioned Hamilton Sheriff Court for permission to remove the remains of the 17 members of the House of Hamilton buried in Hamilton Mausoleum , and have them re-buried in ground they had purchased in Hamilton's Bent Cemetery. The remains of the 11th and 12th dukes were re-buried on the Isle of Arran, while the others were re-buried in Hamilton's Bent Cemetery in 1921. Later history. During the 1960s and 1970s the structure was observed to be subsiding, and a plumb-line hanging on the front of the mausoleum indicated a lean from true verticality. The monolithic, plinth-based construction prevented structural cracking however, and, after many anxious years, the building settled back to near vertical (180 degrees). Inside the  mausoleum are displayed the original bronze entrance doors, based on the Florence Baptistery doors of Lorenzo Ghiberti. The interior has one of the longest-lasting echoes in the world, a phenomenon dramatically demonstrated to visitors by slamming the entrance doors. Another curiosity of the interior architecture is the "Whispering Wa's" or walls. Two people can stand at either end of one of the curved interior walls, facing away from each other into the niche of the wall, and hold a whispered conversation. The remarkable acoustics of the walls project the sound to the listener at the other side. In  1971 the glass oculus in the dome was replaced with a perspex version, which was moved into position by helicopter.