Jain Holy Hill and Temple complex, Mount Girnar, Junagadh (Junagarh), Gujarat, India

View of Alhambra Palace complex from Generallife, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

Ljubljana skyline with view of the city and Ljubljana Castle complex on Castle Hill, Ljubljana, Slovenia, Europe

Ljubljana skyline with view of the city and Ljubljana Castle complex on Castle Hill, Ljubljana, Slovenia, Europe

Vorotnavank ancient fortress and church complex, Sisian, Armenia, Central Asia, Asia

Jain Temple complex in the Fort at Jaisalmer, Rajasthan, India

Mosaic floor, Byzantine Church, hill top palace complex, Masada fortress, UNESCO World Heritage Site, Israel, Middle East

Vorotnavank ancient fortress and church complex, Sisian, Armenia, Central Asia, Asia

Vorotnavank ancient fortress and church complex, Sisian, Armenia, Central Asia, Asia

Tsakhats Kar Monastery with the Smbataberd fortress in the background, near Yeghegnadzor, Vayots Dzor province, Armenia, Eurasia

Aragonese Castle, Ischia, Phlegrean Islands, Gulf of Naples, Campania, Italy

Ancient Urartu fortress near the Ishak Pasha Palace, Dogubayazit, Turkey, Asia Minor, Asia

The Alhambra, a palace and fortress complex, sunset, UNESCO World Heritage Site, Granada, Andalusia, Spain, Europe

The Alhambra, a palace and fortress complex, dusk, UNESCO World Heritage Site, Granada, Andalusia, Spain, Europe

Fortress of Tsarevets, Main Gate, Church of the Blessed Saviour and Patriarchal Complex, Veliko Tarnovo, Bulgaria, Europe

The Shiv Niwas Palace Hotel courtyard and fountain, part of HRH Hotels Group, in the City Palace Complex in Udaipur, Rajasthan, India

The City Palace Complex and Shiv Niwas Palace Hotel owned by 76th Maharana of Mewar, His Highness, Shreeji Arvind Singh Mewar of Udaipur, Rajasthan, India

The City Palace Complex and Shiv Niwas Palace Hotel owned by 76th Maharana of Mewar, His Highness, Shreeji Arvind Singh Mewar of Udaipur, Rajasthan, India

The City Palace Complex and Shiv Niwas Palace Hotel owned by 76th Maharana of Mewar, His Highness, Shreeji Arvind Singh Mewar of Udaipur, Rajasthan, India

The Shiv Niwas Palace Hotel doorway and lobby, part of HRH Hotels Group, in the City Palace Complex in Udaipur, Rajasthan, India

Ornate gateway and plaque of The City Palace Complex of the 76th Maharana of Mewar, Shriji Arvind Singh Mewar of Udaipur, Rajasthan, India

The Shiv Niwas Palace Hotel courtyard and fountain, part of HRH Hotels Group, in the City Palace Complex in Udaipur, Rajasthan, India

The City Palace Complex and Shiv Niwas Palace Hotel owned by 76th Maharana of Mewar, His Highness, Shreeji Arvind Singh Mewar of Udaipur, Rajasthan, India

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Shiva Hindu temple and Ahilya Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh state, India, Asia

Rampart and moat of Red Fort, Delhi, India

Detail of the fortress complex Alhambra, Granada, Andalusia, Spain, Europe

Detail of the fortress complex Alhambra, Granada, Andalusia, Spain, Europe

Grounds of the former NS-Ordensburg Vogelsang (National Socialist estate), Van Dooren barracks, Eifel, North Rhine-Westphalia, Germany, Europe

Uttar Pradesh, Agra Fort, the Red Fort is a fortification and palace complex from the era of the Mughal emperors, North India, India, Asia

Monument to Clemens Winkler in Albertpark, Freiberg, Saxony, Germany, Europe

View from the castle complex of the Alhambra to the former Moorish residential quarter Albaicin in Granada, Andalusia, Spain, Europe

Uttar Pradesh, Agra Fort, the Red Fort, in the palace complex, North India, India, Asia

Republic of Colombia, Colombia, Departamento Bolivar, City of Cartagena de Indias, part of the castle complex, Castillo San Philippe de Barajas, cannons, Colombia, South America

View from the Generalife of the Alhambra castle complex and the city of Granada, Andalusia, Spain, Europe

Uttar Pradesh, Agra Fort, the Red Fort is a fortification and palace complex from the era of the Mughal emperors, part of the fortification complex, North India, India, Asia

View through a keyhole in the castle walls onto parts of the outer castle complex, Hohenrechberg Castle near Schwaebisch-Gmuend, Baden-Wuerttemberg, Germany, symbolic image, Europe

Part of the castle complex, 12th century, Burghausen, castle No. 48, Burghausen, Upper Bavaria, Germany, Europe

Motsameta Monastery Complex near Kutaisi, Georgia, Caucasus, Middle East

Men on bikes ride past an ancient brick minaret toward the old walls and citadel of the town of Ghazni, Afghanistan, October 1, 2002. Made of brick decorated with Kufic and Naksh Script and floral motifs, the minaret dates back to the early 12th century and was built by Sultan Masud III of the Ghaznavid Dynasty, who ruled over an empire encompassing much of Afghanistan, Northern India, Persia and Central Asia. The minaret was once three times as tall as its current 70 feet, and is thought to have been part of a large mosque complex. Now an important truck stop on the road to Kandahar, Ghazni, located on the Lora River at the elevation of 2,225 meters, is the capital of Ghazni province with a population of 35,900, and is a market for sheep, wool, camel hair cloth, corn, and fruit.

Arched window with a view from Alhambra; Granada, Andalusia, Spain

Ananuri, a castle fortress complex along the Aragvi River in Dusheti Municipality, Georgia, Dusheti, Mtskheta-Mtianeti, Georgia

Arched window with a view from Alhambra; Granada, Andalusia, Spain