Not stamps.
The first is the Gumbaz of Manas Mausoleum near Talas in Kyrgyzstan. It might be a cinderella or a label applied to an entrance ticket.
For the second:
https://en.wikipedia.org/wiki/Saimaluu_Tash.
The right-side text reads "Kyrgyz public protection of monuments of history and culture."
As classic_paper wrote, they may have been issued by a culture organisation.