 | Ulster MuseumOrt · Belfast | Robert Nash | CC BY 2.5 | Original ↗ |
 | Ulu Po Heiau State Historical SiteOrt · Honolulu | Joel Bradshaw | Public domain | Original ↗ |
 | ul. Volodarskogo 7Ort · Minsk | Чаховіч Уладзіслаў | CC BY-SA 3.0 | Original ↗ |
 | Ulysses S. Grant MemorialOrt · Washington | Remember | Public domain | Original ↗ |
 | Ulysses S. Grant MonumentOrt · Chicago | unbekannt | Public domain | Original ↗ |
 | Umataka-Sanjūinaba Iseki SiteOrt · Nagaoka | photo: Qurren Taken with Canon IXY 430F | CC BY-SA 3.0 | Original ↗ |
 | Umbilicus UrbisOrt · Rom | Karlheinz Meyer | CC BY-SA 3.0 | Original ↗ |
 | Umbrella HouseOrt · New York | Ru-Shin Shieh | CC BY-SA 4.0 | Original ↗ |
 | Uměleckoprůmyslové museum v PrazeOrt · Prag | VitVit | CC BY-SA 4.0 | Original ↗ |
 | Umiastovskiu RumaiOrt · Vilnius | Alma Pater | CC BY-SA 3.0 | Original ↗ |
| Umiastovskiu RumaiOrt · Vilnius | Alma Pater | CC BY-SA 3.0 | Original ↗ |
 | Umjetnički paviljon u ZagrebuOrt · Zagreb | Bobonajbolji | CC BY-SA 4.0 | Original ↗ |
 | Umpqua Bank PlazaOrt · Portland | M.O. Stevens at en.wikipedia | Public domain | Original ↗ |
 | U.M. Rose SchoolOrt · Little Rock | Valis55 | CC BY-SA 3.0 | Original ↗ |
 | Umschlagplatz WallsOrt · Warschau | Adrian Grycuk | CC BY 3.0 pl | Original ↗ |
 | UNAM Museo de las ConstitucionesOrt · Mexiko-Stadt | Airscrewfilm | CC BY-SA 4.0 | Original ↗ |
 | Underground-AldgateOrt · London | Hugh Llewelyn | CC BY-SA 2.0 | Original ↗ |
 | Underground House aka Las Vegas Underground MansionOrt · Paradise | Gregory Ford Henderson | CC BY-SA 4.0 | Original ↗ |
 | Underground MontrealOrt · Montreal | Jeangagnon | CC BY-SA 3.0 | Original ↗ |
 | Underground Railway MuseumOrt · Budapest | Christo | CC BY-SA 4.0 | Original ↗ |
 | Under the ApartmentsOrt · New York | Federal Highway Adminstration | Public domain | Original ↗ |
 | Underwriters Salvage Corps (Cincinnati, Ohio)Ort · Cincinnati | Nyttend | Public domain | Original ↗ |
 | Unesco World HeritageOrt · Paris | Fred Romero from Paris, France | CC BY 2.0 | Original ↗ |
 | UngargasseOrt · Wien | Maclemo | CC BY-SA 3.0 | Original ↗ |
 | Ungarisches Haus oder HarnischhausOrt · Wien | Buchhändler | CC BY-SA 3.0 | Original ↗ |
 | Ungarn/BudapestOrt · Budapest | Raf24 | CC BY-SA 3.0 | Original ↗ |
 | Uni-CenterOrt · Köln | Raimond Spekking | CC BY-SA 4.0 | Original ↗ |
 | UnicumOrt · Budapest | 12akd | CC BY-SA 4.0 | Original ↗ |
 | Unidad habitacional Nonoalco TlatelolcoOrt · Mexiko-Stadt | Susleriel | CC BY-SA 3.0 | Original ↗ |
 | Unidad Habitacional Santa Fe IMSSOrt · Mexiko-Stadt | Susleriel | CC BY 3.0 | Original ↗ |
 | UNIKATUM Children's Museum LeipzigOrt · Leipzig | Time2Register | CC0 | Original ↗ |
 | UniLodge @ ShafstonOrt · Brisbane | Shiftchange | CC0 | Original ↗ |
 | Union Bank BuildingOrt · Winnipeg | Ccyyrree | CC0 | Original ↗ |
 | Union Bank MuseumOrt · Tallahassee | Tim Ross | Public domain | Original ↗ |
 | Union BuildingOrt · Austin | Guðsþegn | CC BY-SA 3.0 | Original ↗ |
 | Union CanalOrt · Edinburgh | Eileen Henderson | CC BY-SA 2.0 | Original ↗ |
 | Union GrantvilleOrt · San Diego | Allan Ferguson | CC BY 2.0 | Original ↗ |
 | Unioninkatu 39Ort · Helsinki | jampe | CC BY-SA 3.0 | Original ↗ |
 | Union Methodist Episcopal ChurchOrt · Philadelphia | Smallbones | Public domain | Original ↗ |
 | Union Monument in LouisvilleOrt · Louisville | Bedford at English Wikipedia | Public domain | Original ↗ |
 | Union Soldiers and Sailors MonumentOrt · Baltimore | Frederic C. Chalfant | CC BY-SA 3.0 | Original ↗ |
 | Union Station downtown St Louis MoOrt · St. Louis | Steve Morgan | CC BY-SA 4.0 | Original ↗ |
 | Union Station (Houston)Ort · Houston | Ed Uthman, Houston, Texas, USA | CC BY 3.0 | Original ↗ |
| Union Station Memories MuseumOrt · St. Louis | Steve Morgan | CC BY-SA 4.0 | Original ↗ |
 | Union Station Post Office AnnexOrt · St. Louis | Nyttend | Public domain | Original ↗ |
 | Union Station Power HouseOrt · Chicago | Loco Steve from Orpington, UK | CC BY 2.0 | Original ↗ |
 | Union Station (Winston-Salem, North Carolina)Ort · Winston-Salem | Jim Roberts | CC BY-SA 4.0 | Original ↗ |
 | Union Stockyards GateOrt · Chicago | Zol87 from Chicago, Illinois, USA | CC BY-SA 2.0 | Original ↗ |
 | Union StreetOrt · London | Henryrothery | CC BY-SA 4.0 | Original ↗ |
 | Union Street (Boston)Ort · Boston | M2545 | Public domain | Original ↗ |
 | Union Terminal - CmcOrt · Cincinnati | Ɱ | CC BY-SA 4.0 | Original ↗ |
 | Union Transfer And Storage BuildingOrt · Houston | Ed Uthman, Houston, Texas, USA | CC BY 3.0 | Original ↗ |
 | Union Trust BuildingOrt · Seattle | Joe Mabel | CC BY-SA 3.0 | Original ↗ |
 | Union Trust BuildingOrt · Pittsburgh | HoboJones | CC BY-SA 3.0 | Original ↗ |
 | Union Trust Company BuildingOrt · Providence | Marcbela (Marc N. Belanger) | Public domain | Original ↗ |
 | Union WharfOrt · Boston | Swampyank at English Wikipedia | CC BY-SA 3.0 | Original ↗ |
 | UnisphereOrt · New York | Beyond My Ken | CC BY-SA 4.0 | Original ↗ |
 | United Brotherhood of Carpenters and Joiners-Local 132Ort · Washington | Uncommon fritillary | CC BY-SA 3.0 | Original ↗ |
 | United Charities BuildingOrt · New York | ajay_suresh | CC BY 2.0 | Original ↗ |
 | Unité d'HabitationOrt · Marseille | vincent desjardins | CC BY 2.0 | Original ↗ |
 | Unité d'habitationOrt · Berlin | Jean-Pierre Dalbéra from Paris, France | CC BY 2.0 | Original ↗ |
 | United Nations MuseumOrt · Genf | Cancillería Ecuador | CC BY-SA 2.0 | Original ↗ |
 | United Nations ObeliskOrt · San Francisco | Beyond My Ken | CC BY-SA 4.0 | Original ↗ |
| United Nations PlazaOrt · San Francisco | Beyond My Ken | CC BY-SA 4.0 | Original ↗ |
 | United Nations Slavery MemorialOrt · New York | unbekannt | CC BY-SA 3.0 | Original ↗ |
 | United States Capitol rotundaOrt · Washington | Matt H | CC BY-SA 3.0 | Original ↗ |
 | United States Customs HouseOrt · Savannah | Ebyabe | CC BY-SA 3.0 | Original ↗ |
 | United States Holocaust Memorial MuseumOrt · Washington | unbekannt | CC BY-SA 3.0 | Original ↗ |
 | United States Lightship ReliefOrt · Oakland | Sanfranman59 | CC BY-SA 3.0 | Original ↗ |
 | United States Marine HospitalOrt · Louisville | Censusdata at en.wikipedia | Public domain | Original ↗ |
 | United States Parcel Post StationOrt · Baltimore | Smallbones | CC0 | Original ↗ |
 | United States Rubber Company Mill ComplexOrt · Providence | John Phelan | CC BY-SA 3.0 | Original ↗ |
 | United Workers CooperativesOrt · New York | ALT55-VictorM | CC BY-SA 3.0 | Original ↗ |
 | Uniting Church Central Memorial HallOrt · Brisbane | Shiftchange | CC0 | Original ↗ |
 | Unity BuildingsOrt · Liverpool | Rept0n1x | CC BY-SA 3.0 | Original ↗ |
 | Unity HallOrt · Chicago | Andrew Jameson | CC BY-SA 3.0 | Original ↗ |
 | Unity TowerOrt · Krakau | Zygmunt Put | CC BY-SA 4.0 | Original ↗ |
 | Universal Links on Human RightsOrt · Dublin | Lisa Jarvis | CC BY-SA 2.0 | Original ↗ |
 | Universalmuseum JoanneumOrt · Graz | Photo: Andreas Praefcke | CC BY 3.0 | Original ↗ |
 | Universidad de MurciaOrt · Murcia | Djota | CC BY-SA 4.0 | Original ↗ |
 | Universidad LaboralOrt · Gijón | Claudio85 | CC BY-SA 3.0 | Original ↗ |
 | Universidad Ramón LlullOrt · Barcelona | Pere prlpz | CC BY-SA 3.0 | Original ↗ |
 | Università Cattolica (Chiostri)Ort · Mailand | Gabriele Barni from Monza, Italy | CC BY-SA 3.0 | Original ↗ |
 | Universitá degli Studi di Napoli Federico II Real Museo MineralogicoOrt · Neapel | Giuseppe Guida | CC BY-SA 4.0 | Original ↗ |
 | Universitas IstropolitanaOrt · Bratislava | Wizzard | Public domain | Original ↗ |
 | UniversitätsplatzOrt · Salzburg | Andrew Bossi | CC BY-SA 2.5 | Original ↗ |
 | Universiteitsmuseum UtrechtOrt · Utrecht | Sandra Fauconnier | CC BY 4.0 | Original ↗ |
 | Universiteit van Amsterdam - Oudemanhuispoort CampusOrt · Amsterdam | Pimvantend | CC BY-SA 4.0 | Original ↗ |
 | University ClubOrt · Tulsa | Caleb Long | CC BY-SA 2.5 | Original ↗ |
 | University Club Tower CondominiumsOrt · Milwaukee | Zonafan39 | CC BY-SA 3.0 | Original ↗ |
 | University CrossingsOrt · Philadelphia | User TexasDex on en.wikipedia | Public domain | Original ↗ |
 | University LoftsOrt · Cleveland | Warren LeMay from Cincinnati, OH, United States | CC0 | Original ↗ |
 | University of Arizona Museum of ArtOrt · Tucson | Daderot | CC0 | Original ↗ |
 | University of Bristol Theatre CollectionOrt · Bristol | Nitrileglove | CC BY-SA 4.0 | Original ↗ |
 | University of Bristol Victoria RoomsOrt · Bristol | Rbrwr | CC BY-SA 3.0 | Original ↗ |
 | University of Chicago Oriental InstituteOrt · Chicago | Salsb | CC BY-SA 2.5 | Original ↗ |
 | University of Nebraska State MuseumOrt · Lincoln | Hanyou23 | CC BY-SA 4.0 | Original ↗ |
 | University of New Mexico Art MuseumOrt · Albuquerque | John Phelan | CC BY-SA 4.0 | Original ↗ |
 | University of Queensland ferry wharfOrt · Brisbane | Nick-D | CC BY-SA 4.0 | Original ↗ |
 | University of Wisconsin Armory and GymnasiumOrt · Madison | w_lemay | CC BY-SA 2.0 | Original ↗ |