This is the third installment in a series of looks into alternative visions of Riga, this time dedicated to passengers, traffic and transport.
Opening May 23, it includes city plans that were once kept secret.
"It's a staple of the Soviet regime. You see, it reads sekret here. It's secret, or for internal use only. In the Soviet Era you had to have access to state secrets in order to work with the plans," said architect Jānis Lejnieks.
The oldest plans date back to the 20s and 30s of the previous century while the newest are from the 90s. They also include the plan for the Riga metro, which attracted great interest during the Museum Night when 4,500 people visited the museum.
The Riga that isn't there is on show until August 11.