Uskmouth Power Station as Two Streams (industrial areas)
Amy locates a safe place to hide in Two Streams amongst the temporal engines.
Source: The Doctor Who Locations Guide
“The Girl Who Waited” Filming Locations
Doctor Who episode “The Girl Who Waited” was filmed in Newport & Cardiff in the United Kingdom.
Wales Millennium Centre as Two Streams (arrival area)
Amy gets trapped within this facility and is forced to wait for the Doctor and Rory to come rescue her.
Source: The Doctor Who Locations Guide
Dyffryn House & Gardens as Two Streams (gardens)
Amy comes upon these simulated gardens while searching Two Streams for somewhere safe.
Source: The Doctor Who Locations Guide