Khasekhemwy place of burial Umm el-Qa'ab
Khasekhemwy apparently undertook considerable building projects upon the reunification of Egypt. He built in stone at el-Kab, Hierakonpolis, and Abydos. 
He apparently built a unique, as well as huge, tomb at Abydos, the last such royal tomb built in that necropolis (Tomb V). The trapezoidal tomb measures some 70 meters (230 ft) in length and is 17 meters (56 ft) wide at its northern end, and 10 meters (33 ft) wide at its southern end. This area was divided into 58 rooms. Prior to some recent discoveries from the 1st dynasty, its central burial chamber was considered the oldest masonry structure in the world, being built of quarried limestone. Here, the excavators discovered the king's scepter of gold and sard, as well as several beautifully made small stone pots with gold leaf lid coverings, apparently missed by earlier tomb robbers. In fact, Petrie detailed a number of items removed during the excavations of Amélineau. Other items included flint tools, as well as a variety of copper tools and vessels, stone vessels and pottery vessels filled with grain and fruit. There were also small, glazed objects, carnelian beads, model tools, basketwork and a large quantity of seals.
Khasekhemwy built enclosures at Nekhen, and at Abydos (now known as Shunet ez Zebib) and was buried there in the necropolis at Umm el-Qa'ab. He may also have built the Gisr el-Mudir at Saqqara.
An inscription on a stone vase records him “fighting the northern enemy within Nekheb”. This means that Lower Egypt may have invaded and almost taken the capital of Nekhen.
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