Two more pyramids and an illuminated fountain can be observed :) in Kronvalda park. None of them are ancient and the pyramides cover the entrance to the underground parking lot.
Actually this is a small restaurant in Ridzene hotel covered with a glass pyramide. It is very close to old town, Embassy of U.S. and Embassy of France, Art museum, Freedom monument, Orthodox church, concert hall Kongresa nams, Raina park and dance club Essential - a very good location for a hotel.