Emen, Bulgaria published that SpaceX was considering leasing SLC-4W for use as a RTLS vertical-landing facility for reusable first-stage boosters. Principal structures on the pad were demolished in September 2014 as construction of the landing pad began and was completed sometime around 2017. Detailed landing history. SpaceX has perfected RTLS landings on two landing pads that it has built at Cape Canaveral Space Force Station. It was initially thought that the booster used to launch a fourth batch of ten Iridium NEXT satellites in December 2017 would be the first to land at Vandenberg AFB but this mission was ultimately 	Vandenberg Space Launch Complex 4
25977508	performed in expendable mode. In July 2018, SpaceX applied for a permit to the Federal Communications Commission (FCC) for post-landing communications with a first stage of a Falcon 9 rocket at SLC-4W, pointing to a possible landing sometime in September 2018, possibly for the SAOCOM 1A mission although this was later rescheduled for 8 October 2018 (UTC). A few weeks prior to this first landing attempt it was known to the public, again via FCC permits and also public warnings about sonic booms in the area, that SpaceX had renamed this pad as Landing Zone 4. Finally, this pad 	Vandenberg Space Launch Complex 4
25977509	was first used for a rocket booster landing of a first stage of a Falcon 9 launch vehicle in October 2018, recovering the booster that had just launched the Argentinian SAOCOM 1A satellite. Vandenberg Space Launch Complex 4 Space Launch Complex 4 (SLC-4) is a launch and landing site at Vandenberg Space Force Base, California, U.S. It has two pads, both of which are used by SpaceX for Falcon 9, one for launch operations, and other as Landing Zone 4 (LZ-4) for SpaceX landings. The complex was previously used by Atlas and Titan rockets between 1963 and 2005. It consisted 	Vandenberg Space Launch Complex 4
25977510	Emen, Bulgaria Emen, Bulgaria Emen ( ) is a village in Veliko Tarnovo Municipality, Veliko Tarnovo Province, Bulgaria, famous for the nearby caves and canyon. In recent years it has become a major tourist destination, receiving both domestic and foreign visitors. Emen's population is about 100 people, but it triples during the summer. History. The Emen cave bears evidence of human habitation, dated to the Neolith. Later, Romans settled in the area and built an outpost on Kaleto hill on the verge of the present-day village. Fortifications included a rock wall from two sides, while the other two sides were naturally protected 	Emen, Bulgaria
25977511	by the vertical walls of the Emen canyon. Nowadays, parts of the wall are preserved, but treasure-hunter raids have reduced archaeological evidence. The present-day name of the village is said to derive from the times of the Ottoman rule over Bulgaria. Emen was the name of the Turk who owned all the land and Christian people of the village. With the Liberation of Bulgaria he was most likely expelled from the country, but the village kept its name. Today, a single Turkish family lives in Emen, but it bears no relation to the previous landowner. Geography and natural 	Emen, Bulgaria
25977512	sights. Emen is located in Veliko Tarnovo Province, about 20 km away from capital of the province. The river Negovanka, a tributary to Rositsa flows right through the village, through the Emen Canyon and ends up in the Mihaltsi dam situated about 5 km north of the village. The name of the river comes from Latin and means short river with a near source". In Palaeolithic times, the river carved a gorge (or canyon), which bears the name of the village. The Emen Canyon consists of two parts, called "Goren" (Upper) and "Dolen" (Lower) "Boaz". The Upper Boaz stretches through  5 km from the nearby village of Novo Selo to Emen, itself. The Lower part of the canyon begins in the north part of Emen and eventually opens up after the Mihaltsi dam. The Emen Canyon was declared a "Natural Monument" in 1980. As a result, some human activities like lumbering and driving motor vehicles are prohibited on the 25.5 hectare area of the Natural Monument. It partially overlaps with another Natural Monument - the Momin Skok one, which encompasses a small area around the waterfall of the same name. One of the first eco paths in Bulgaria passes through the  Emen Gorge on its way to the Momin Skok Waterfall. The Emen cave is located at the very beginning of the eco path. With its length of 3,113 meters, it is the 17th longest cave in Bulgaria. This has made it suitable for many human activities throughout the years. It has consecutively been used to grow mushrooms and mature cheese. In Communist times it even became an arms depot of a military base located immediately above it. Currently, human presence in the cave is, at least officially, restricted to allow for bats to breed uninterrupted. Bat species inhabiting the cave  include: greater horseshoe bat, Blasius's horseshoe bat, Mediterranean horseshoe bat, common bent-wing bat, greater and lesser mouse-eared bat. Speleologists from Ruse have discovered a large cave system in the vicinity of the village during expeditions between 1986 and 1991. The caves Ruse (3,306 metres long), Troana (3,234 m) and Bambalova Dupka (2,923 m) are all located in the Lower Boaz. Emen, Bulgaria Emen ( ) is a village in Veliko Tarnovo Municipality, Veliko Tarnovo Province, Bulgaria, famous for the nearby caves and canyon. In recent years it has become a major tourist destination, receiving both domestic and foreign visitors