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Top 20 Spy Cities

The secrets are hidden behind fortified walls in cities across the world, inside towering, windowless skyscrapers and fortress-like concrete structures that were built to withstand earthquakes and even nuclear attack.
Thousands of people pass by the buildings each day and rarely give them a second glance, because their function is not publicly known.
Added by Chovgan
251 users · 353 views
Avg. score: 8 of 20 (40%)
Required scores: 1, 4, 7, 9, 12   
How many have you visited?
1
Amsterdam, Netherlands
2
Baku, Azerbaijan
3
Berlin, Germany
4
Brussels, Belgium
5
Budapest, Hungary
6
Chicago, USA
7
Geneva, Switzerland
8
Istanbul, Turkey
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9
Lisbon (Portugal)
10
London, United Kingdom
11
Mexico City, Mexico
12
Moscow, Russia
13
New York, USA
14
Paris, France
15
Prague, Czech Republic
16
Riga, Latvia
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17
Tallinn, Estonia
18
Venice, Italy
19
Vienna, Austria
20
Washington, USA
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