View of the walled and fortified city of Elvas, UNESCO World Heritage Site, Alentejo, Portugal, Europe

View of Old Walled City of Dubrovnik, UNESCO World Heritage Site, and Adriatic Sea from elevated position, Dubrovnik Riviera, Croatia, Europe

Pre-Columbian Mayan walled city of Tulum, Quintana Roo, Mexico, North America

Elevated view of the Medina or old walled city, Fez, Morocco, North Africa, Africa

View of the Old Walled City of Dubrovnik at dusk, UNESCO World Heritage Site, Dubrovnik Riviera, Croatia, Europe

Shipquay Street, inside the walled city, Derry (Londonderry), County Londonderry, Ulster, Northern Ireland, United Kingdom, Europe

Pre-Columbian Mayan walled city of Tulum, Quintana Roo, Mexico, North America

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

View of the walled and fortified city of Elvas, UNESCO World Heritage Site, Alentejo, Portugal, Europe

Panoramic view of the Old Walled City of Dubrovnik at sunset, UNESCO World Heritage Site, Dubrovnik Riviera, Croatia, Europe

Night time lights of traffic, Jaffa Gate, Old Walled City, Jerusalem, Israel, Middle East

A pool and Diwan-i-Khas, a building in the courtyard of the Mughal walled city of Fatehpur Sikri, UNESCO World Heritage Site, Uttar Pradash, India, Asia

Panoramic view of Old Walled City of Dubrovnik and Adriatic Sea from elevated position, Dubrovnik Riviera, Croatia, Europe

View of Old Walled City of Dubrovnik, UNESCO World Heritage Site, and Adriatic Sea from elevated position, Dubrovnik Riviera, Croatia, Europe

Pre-Columbian Mayan walled city of Tulum, Quintana Roo, Mexico, North America

Aerial view of the walled part of Old Town, UNESCO World Heritage Site, in the capital city of Tallinn, Estonia, Europe

Elevated view of the walled part of Old Town, UNESCO World Heritage Site, in the capital city of Tallinn, Estonia, Europe

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

The historic walled city of Famagusta, in Turkish occupied North Cyprus

Dome of the Rock, Haram ash-Sharif (Temple Mount), back alley of Old Walled City, Jerusalem, Israel, Middle East

The Medina, old walled city from hill, Fez, Morocco, North Africa, Africa

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

Early morning aerial of the walled city, Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

Early morning aerial of the walled city of Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

Early morning aerial of the walled city of Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

Early morning aerial of the walled city of Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

The historic walled city of Famagusta, in Turkish occupied North Cyprus

Tourists in the historic walled city of Famagusta, in Turkish occupied North Cyprus

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

Close-up of a goat in front of an ornate door in the walled city of Shibam, in the Wadi Hadramaut, Yemen, Middle East

Backs of tall mud brick houses showing holes in the wall for toilets, the walled city of Shibam, UNESCO World Heritage Site, Wadi Hadramaut, south Yemen, Middle East

Backs of the tall mud brick houses on the south side of the walled city of Shibam, UNESCO World Heritage Site, in the Wadi Hadramaut, south Yemen, Middle East

Camels, with the backs of the tall mud brick houses on the south side of the walled city of Shibam beyond, UNESCO World Heritage Site, Wadi Hadramaut, south Yemen, Middle East

Priest at the tomb of Jesus Christ, Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel, Middle East

Courtyard of the Church of the Holy Sepulchre, Old Walled City, UNESCO World Heritage Site, Jerusalem, Israel, Middle East

Old Walled City, Jerusalem, Israel, Middle East

Jewish man in traditional clothes, Old Walled City, Jerusalem, Israel, Middle East

Jewish man in traditional clothes in front of the Hurva Synagogue arch, Old Walled City, Jerusalem, Israel, Middle East

Orthodox Christian priest in traditional clothes, Old Walled City, Jerusalem, Israel, Middle East

Jewish man in traditional clothes, Old Walled City, Jerusalem, Israel, Middle East

Jewish man in traditional clothes with child, Old Walled City, Jerusalem, Israel, Middle East

Car lights, walled city by night, Damascus, Syria, Middle East

Chinese Zodiac statue in Kowloon Walled City, Kowloon, Hong Kong, China, Asia

Couple posing in the street, Old Walled-in City, Cartagena, Colombia, South America

Carriage through the Ciudad Amurallada (Walled Town), UNESCO World Heritage Site, Cartagena, Colombia, South America

Jewish man in traditional clothes, Old Walled City, Jerusalem, Israel, Middle East

Man being blessed at the Western Wailing Wall, Old Walled City, Jerusalem, Israel, Middle East

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

Dome of the Rock, Haram ash-Sharif (Temple Mount), Old Walled City, UNESCO World Heritage Site, Jerusalem, Israel, Middle East

Jewish man with child in pram, praying at the Western Wailing Wall, Old Walled City, Jerusalem, Israel, Middle East

Wall painting of Jesus Christ's death, Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel, Middle East

Arch of the Hurva Synagogue, Old Walled City, Jerusalem, Israel, Middle East

Praying at the Western (Wailing) Wall, Old Walled City, Jerusalem, Israel, Middle East

Orthodox priest, Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel, Middle East

Harbour and view of old walled city and church of Santa Maria de la Asuncion, Hondarribia, Basque country, Euskadi, Spain, Europe

The souk of the Medina (old walled town), Fez, Morocco, North Africa, Africa

David Street tourist market, Old Walled City, Jerusalem, Israel, Middle East

David Street tourist market, Old Walled City, Jerusalem, Israel, Middle East

Almshouse in Kowloon Walled City, Kowloon, Hong Kong, China, Asia

Nuns in front of wall painting of Jesus Christ's death, Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel, Middle East

The medina or old walled city from a hill, Fez, UNESCO World Heritage Site, Morocco, North Africa, Africa

Souk in the old walled town or medina, Fez, Morocco, North Africa, Africa

The Buda gate, one of six gates leading into the ancient walled city of Harar, Ethiopia, Africa

Tomb of Jesus Christ, Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel

Jewish man in David Street tourist market, Old Walled City, Jerusalem, Israel, Middle East

David Street tourist market, Old Walled City, Jerusalem, Israel, Middle East

The market at the entrance to the Shoa Gate, one of six gates leading into the walled city of Harar, Ethiopia, Africa

Praying at the Western (Wailing) Wall, Old Walled City, Jerusalem, Israel, Middle East

Jewish men in traditional clothes, Old Walled City, Jerusalem, Israel, Middle East

Praying at the Western (Wailing) Wall, Old Walled City, Jerusalem, Israel, Middle East

Man selling tea in traditional costume, Old Walled City, Jerusalem, Israel, Middle East

Chinese Zodiac statues in Kowloon Walled City, Kowloon, Hong Kong, China, Asia

The souk in the medina, the old walled town, Fes, Morocco, North Africa, Africa

Dome of the Rock, Haram ash-Sharif (Temple Mount), Old Walled City, Jerusalem, Israel, Middle East

Ceiling painting of Jesus Christ, Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel, Middle East

The Buda gate, one of six gates leading into the ancient walled city of Harar, Ethiopia, Africa

Nuns in the Church of the Holy Sepulchre, Old Walled City, Jerusalem, Israel

Praying at the Western (Wailing) Wall, Old Walled City, Jerusalem, Israel, Middle East

The Medina or old walled city, UNESCO World Heritage Site, Fez, Morocco, North Africa, Africa

Chateau and Walled city, St. Malo, Brittany, France, Europe

The Walled City (Ciudad Amurallada), UNESCO World Heritage Site, Cartagena, Colombia, South America

Kowloon Walled City, Kowloon, Hong Kong, China, Asia

Praying at the Western (Wailing) Wall, Old Walled City, Jerusalem, Israel, Middle East

Pavilion in Kowloon Walled City, Kowloon, Hong Kong, China, Asia

Walled city, Dubrovnik, Croatia, Europe

Ruins in Kowloon Walled City, Kowloon, Hong Kong, China, Asia

Walled city seen from the Roman ruins, Avila, Castilla y Leon, Spain, Europe

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Outer walls of the Ark Fortress, Registan Square, Bukhara, Uzbekistan

Tulum is the site of a Pre-Columbian Maya walled city serving as a major port for Cobá, Daily tour buses bring a constant stream of visitors to the site,

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Tulum is the site of a Pre-Columbian Maya walled city serving as a major port for Cobá, Daily tour buses bring a constant stream of visitors to the site,

Maya walled city, Tulum, Quintana Roo, Halbinsel Yucatan, Mexico

Walled Old City of Dubrovnik with harbour, Dubrovnik, Croatia

Walled Old City of Dubrovnik with harbour, Dubrovnik, Croatia

Walled Old City of Dubrovnik, Croatia

Walled Old City of Dubrovnik, Croatia

Walled Old City of Dubrovnik, Croatia

Cartagena, Colombia, 8 May, 2024: Colombia, lady in national colorful costume posing in Walled City historic center of Cartagena near Colombian flag, South America