With its ancient Citadel, mausoleums, pagodas, and palaces, Hue is a haven for history buffs. Winding through this historic capital is Perfume River (Song Huong), overshadowed by the walled Forbidden City on its north bank. Built under Emperor Gia Long in 1805, this fortress covers 5 km (3 miles) of Hue's waterfront. Equally appealing are the tombs scattered throughout the city, including the Khai Dinh mausoleum that stands out from the pack due to its detailed mosaic work. As a designated UNESCO World Heritage site, Hue still bears scars from the Vietnam War, having endured insurmountable suffering in its close proximity to the DMZ.