metro systems of the world #travel

1993 Istanbul - https://moodysbnn.blogspot.com/2020/05/1993-istanbul.html
2015 Tbilisi - https://moodysbnn.blogspot.com/2020/04/2015-tbilisi.html
2017 Shanghai, Shenzhen, Hong Kong - https://moodysbnn.blogspot.com/2020/04/2017-shanghai-shenzhen-hong-kong.html
2018 Yerevan - https://moodysbnn.blogspot.com/2020/04/2018-armenia.html
2019 Tashkent - https://moodysbnn.blogspot.com/2020/05/2019-uzbekistan.html