Abandoned places (maybe/maybe Not)       UrbanExploration
Shipwrecks:  WreckLists( 1, 2)  ConcreteBattleship  LST1148  USS-Amesbury  USS-Arizona  USS-Utah  WestLochExplosion  IJN-Musashi  WilhelmGustloff 
Military:  Corregidor  BatteryWay  BrklynNavyYard  PhilaNavyYard  FortMifflin  FortDelaware  CapeMayBunker  NWSearle  SandyHookNJ (FortHancock, NikeSite) 
New Jersey:  NPDC  Ong'sHat  RiversidePower  HackensackRiver  MeadowLands  PassaicRiver  RahwayRiver  RaritanRiver  CrabIsland  SouthRiver  D&Rcanal  MauriceRiver  SS-Atlantus 
New York:  HudsonRiver  GovernorsIsland  HellGate  GowanusCanal  ArthurKill  ShootersIsland  PrallsIsland  IsleOfMeadows  FreshKills  BoatGraveyard  LiftBridge  KillVanKull 
Philadelphia:  BigU  SchuylkillRiver  WaterWorks  PennCanal  PortOfPhila  DelawareRiver  USS-Olympia  P.S.H.  ShotTower  C&Dcanal  PeaPatchIsland  ChesterIslandBar  LittleTinicumIsland  Smith&WindmillIslands  PettysIsland  Cramp'sShipYard  BurlingtonIsland 
Other:  EAPoe'sGrave  TI  SanClementeIsland  Kahoolawe  PearlHarbor  OahuAerodromes  MekongDelta  MonkeyMtn.  Maracaibo 

Ruins (some are, while some are not)   and Fortifications
American SouthWest: 
Anasazi - ChacoCanyon PuebloBonito MesaVerde Hovenweep Bandelier CanyonDeChelly
Hopi
Meso-america 
Aztec - Tenochtitlan Texcoco Tlacopan Azcapotzalco
Maya - sites ChichenItza Tulum Palenque Tikal Copán SantoTomásChichicastenango OnlineResorces
Olmec - SanLorenzoTenochtitlán
Toltec - Tula&Hidalgo
Other - Teotihuacan
Andes
Incas - Vilcamba Sacsayhuamán TamboColorado Ollantaytambo Cahuachi Chankillo
Moche - ChanChan HuacaDeLaLuna HuacaDelSol
Chibcha -
Cańaris -
Other - Tiahuanaco Kuelap
Baltic:  Königsberg LithCastles Trakai GedisTower Vilnius PolCastles Malbork
CentralEurope:  Wewelsburg
Italy:  Rome AurelianWalls AquaClaudia&AnioNovus Palatine Lupercal BasilicaDiSanClemente AppianWay Catacombs CatacombeDiSanCallisto Basilica&CatacombeDiSanSebastiano CeciliaMetella'sTomb CircoDiMassenzio Ostia Tiber
Greece:  Thermopylae
AsiaMinor:  Byzantium Troy Ephesus GöbekliTepe
MiddleEast:  CrusaderCastles Baalbek
Africa:  Carthage
Other:  EuropeanCastles TemplarPlaces TeutonicKnightsPlaces