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Tour boats moored on the Guadalquivir river bank near the Torre del Oro, Paseo de Cristobal Colon, Seville, Andalusia, Spain, Europe

Tour boats moored on the Guadalquivir river near the Torre del Oro at sunset, Seville, Andalusia, Spain, Europe

Battlements, stone ramparts and watch tower in historic castle ruins at Arraiolos (Pavao dos Alcaides), built in the 14th century, Alentejo, Portugal, Europe

O'Brien's Tower, Cliffs of Moher, Cliffs Coastal Walk, County Clare, Munster, Republic of Ireland, Europe

Desert View Watchtower, Grand Canyon National Park, UNESCO World Heritage Site, Northern Arizona, United States of America, North America

Desert View Watchtower, Grand Canyon National Park, UNESCO World Heritage Site, Northern Arizona, United States of America, North America

View of Grand Canyon west of the historic Watch Tower, managed by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

Desert View Watchtower, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Downward view from the third floor in the historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

Stairs up to the third floor in the historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

The top floor of the historic Watchtower at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Sunset at Torre del Oro (Tower of Gold), a watchtower on the bank of the Guadalquivir River in Seville, Andalusia, Spain, Europe

Torre del Oro (The Golden Tower), a dodecagonal military watchtower, Seville, Andalucia, Spain, Europe

The palm-fringed Torre della Polveriera, a historic stone watchtower in Piazza della Juharia atop the Old Town walls, Alghero, Sassari, Sardinia, Italy, Mediterranean, Europe

Downward view from the second floor in historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

Stairs up to the seconnd floor in the historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

North view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

An interior view of the historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

Stairs going down from the fourth floor in the historic Desert View Watchtower at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Southwest view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Northwest view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

The top floor of the historic Watchtower at Grand Canyon South Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

View of the Grand Canyon east of the historic Watch Tower, managed by the National Park Service, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

An interior view of the historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, Arizona, United States of America, North America

San Giovanni di Sinis historic tower, drone aerial view of San Marco Cape at sunset, Sardinia, Italy, Mediterranean, Europe

The swirl of stars in the night sky over Grand Canyon South Rim viewed from Navajo Point with the historic Watchtower in the distance on the right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sunset at Torre del Oro (Tower of Gold), a watchtower on the bank of the Guadalquivir River in Seville, Andalusia, Spain, Europe

Torre del Oro (The Golden Tower), a dodecagonal military watchtower in Seville, Andalucia, Spain, Europe

View across the tranquil waters of Calura Bay, sunrise, ancient watchtower visible on headland, Cefalu, Palermo, Sicily, Italy, Mediterranean, Europe

Sunset at Torre del Oro (Tower of Gold), a watchtower on the bank of the Guadalquivir River in Seville, Andalusia, Spain, Europe

Sunset at Torre del Oro (Tower of Gold), a watchtower on the bank of the Guadalquivir River in Seville, Andalusia, Spain, Europe

Sunset at Torre del Oro (Tower of Gold), a watchtower on the bank of the Guadalquivir River in Seville, Andalusia, Spain, Europe

View across field to ruined medieval watchtower on cliffs above the Gulf of Castellammare, Scopello, Trapani, Sicily, Italy, Mediterranean, Europe

Long exposure of Betis Street in Triana and Guadalquivir River and the Torre del Oro on the left bank in late afternoon, Seville, Andalucia, Spain, Europe

Pagoda at Chinese Temple, Pyin Oo Lwin, also known as Pyin U Lwin and Maymyo, near Mandalay, Myanmar, (Burma)

View of the watchtower at Gruissan in Languedoc-Roussillon, France, Aude, Gruissan, village in Circulade testifies of a Medieval origin, strategic sign of defense and Christian symbol

Neuengamme concentration camp memorial site, SS main guard building with guard tower, right, prisoner block 1-4, centre, foundations of the detainee block, emerging thunderstorm, Hamburg, Hamburg, Hamburg, Germany, Europe

Historic adobe fortification Liwa Fort or Castle, Batinah Region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification Liwa Fort or Castle, Batinah Region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification Al Khandaq Fort or Castle, Buraimi, Al Dhahirah region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification, Al Faiqain Fort or Castle near Manah, Dakhliyah Region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification Nakhal, Nakhl Fort or Castle, Hajar al Gharbi Mountains, Batinah Region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification Nakhal, Nakhl Fort or Castle, Hajar al Gharbi Mountains, Batinah Region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification Nakhal, Nakhl Fort or Castle, Hajar al Gharbi Mountains, Batinah Region, Sultanate of Oman, Arabia, Middle East

Historic adobe fortification Rustaq Fort or Castle, Hajar al Gharbi Mountains, Batinah Region, Sultanate of Oman, Arabia, Middle East

Memorial Guenter Litfin for the first person shot dead at the Berlin Wall, Kieler Strasse street at the Berlin-Spandau Schifffahrtskanal channel, Berlin, Germany, Europe

Memorial Guenter Litfin for the first person shot dead at the Berlin Wall, Kieler Strasse street at the Berlin-Spandau Schifffahrtskanal channel, Berlin, Germany, Europe

Memorial Guenter Litfin for the first person shot dead at the Berlin Wall, Kieler Strasse street at the Berlin-Spandau Schifffahrtskanal channel, Berlin, Germany, Europe

Memorial Guenter Litfin for the first person shot dead at the Berlin Wall, Kieler Strasse street at the Berlin-Spandau Schifffahrtskanal channel, Berlin, Germany, Europe

Memorial Guenter Litfin for the first person shot dead at the Berlin Wall, Kieler Strasse street at the Berlin-Spandau Schifffahrtskanal channel, Berlin, Germany, Europe

Royal Guernsey Golf Club, Martello towers, watch towers and fortified towers built in the 17th century, next to the fairways, at Pembroke bay in the northeast of the Channel Island of Guernsey, Europe

Julius Tower and arsenal, statues from Siegesallee boulevard in Berlin's Tiergarten, Spandau Citadel fortress, Berlin, Germany, Europe

The Schwedenturm tower in winter, Mainau Island, County Konstanz, Baden-Wuerttemberg, Germany, Europe

City wall, Revaler city fortification, Tallinna linnamueuer with wall towers and Olai church, Tallinn, Estonia, Europe

Historic adobe fortification Nakhal, Nakhl Fort or Castle, Hajar al Gharbi Mountains, Batinah Region, Sultanate of Oman, Arabia, Middle East

Julius Tower and arsenal, statues from Siegesallee boulevard in Berlin's Tiergarten, Spandau Citadel fortress, Berlin, Germany, Europe

On the banks of the Guadalquivir River with the historic Torre del Oro tower at dusk, Seville, Andalucia, Spain, Europe

Historic adobe fortification Nakhal, Nakhl Fort or Castle, Hajar al Gharbi Mountains, Batinah Region, Sultanate of Oman, Arabia, Middle East