White Nights

 Official Postcrossing card RU-400413 with many thanks to Alexey :)

Didysis figmedis. Sri Lanka

 Official Postcrossing card BY-169779 with many thanks to Polina!

Ouro Preto

 Official Postcrossing card BR-148360 with many thanks to Cecilia!

Inge Look

 Official Postcrossing card FI-1062698 with many thanks to Minna!

Amsterdam

Official Postcrossing card NL-613614 with many thanks to Andrea!

Levitan

Official Postcrossing card RU-369655 with many thanks to Alena!

First Flight

 With many thanks to?..

Nuclear-powered ice-breaker "Lenin"

 With so many thanks to Sofya!

Nuclear-powered ice-breaker "Russia"

With many thanks to Sofya!

Gagarin card and envelope

 With many thanks to natalya108!